The Exchange incident report includes a summary of the specific mail flow, such as the name of the sender, recipient, and the Exchange rule that was activated and also; we can ask to include an attachment of the original E-mail message that was captured.. Based on your mentioned description about "SPF authentication fails for our outbound emails sent by Exchange Online despite having this DNS record : v=spf1 include:spf.protection.outlook.com -all", once could you please provide us your detailed error message screenshot, your SPF record and domain via private message? Most of the mail infrastructures will leave this responsibility to us meaning the mail server administrator. You can also subscribe without commenting. However, there are some cases where you may need to update your SPF TXT record in DNS. For example, vs. the Exchange Online spam filter policy that marks every incoming E-mail message that has the value of SPF = Fail as spam mail without distinction, when using the option of Exchange rule, we can define a more refined version of this scenario, a condition in which only if the sender uses our domain name + the result from the SPF verification test is Fail, only, then the E-mail message will be identified as Spoof mail. A wildcard SPF record (*.) SPF is added as a TXT record that is used by DNS to identify which mail servers can send mail on behalf of your custom domain. The E-mail message is a spoofed E-mail message that poses a risk of attacking our organization users. Learning about the characters of Spoof mail attack. Think of your scanners that send email to external contacts, (web)applications, newsletters systems, etc. This is where we use the learning/inspection mode phase and use it as a radar that helps us to locate anomalies and other infrastructure security issues. See Report messages and files to Microsoft. These tags are used in email messages to format the page for displaying text or graphics. This article describes how to update a Domain Name Service (DNS) record so that you can use Sender Policy Framework (SPF) email authentication with your custom domain in Office 365. With a soft fail, this will get tagged as spam or suspicious. Nearly all large email services implement traditional SPF, DKIM, and DMARC checks. What is the conclusion such as scenario, and should we react to such E-mail message? SPF is the first line of defense in this and is required by Microsoft when you want to use a custom domain instead of the onmicrosoft.com domain. When you have created a new Office 365 tenant and your subscription includes Exchange Online or Teams, then you will need to add a couple of DNS records. Find out more about the Microsoft MVP Award Program. For more information, see Configure anti-spam policies in EOP. EOP includes a default spam filter policy, which includes various options that enable us to harden the existing mail security policy. What does SPF email authentication actually do? Email advertisements often include this tag to solicit information from the recipient. The three primary SPF sender verification test results could be: Regarding the result, in which the SPF result is Pass, this is a sign that we can be sure that the mail sender is a legitimate user, and we can trust this sender. SPF discourages cybercriminals from spoofing your domain, spam filters will be less likely to blacklist it. Q3: What is the purpose of the SPF mechanism? After a specific period, which we allocate for examining the information that collected, we can move on to the active phase, in which we execute a specific action in a scenario that the Exchange rule identifies an E-mail message that is probably Spoof mail. and are the IP address and domain of the other email system that sends mail on behalf of your domain. Anti-spoofing protection considers both SPF hard fails and a much wider set of criteria. Disabling the protection will allow more phishing and spam messages to be delivered in your organization. TechCommunityAPIAdmin. For a list of domain names you should include for Microsoft 365, see External DNS records required for SPF. An SPF record is required for spoofed e-mail prevention and anti-spam control. Exchange Online (EOP), include spam filter policy, which contains many security settings that are disabled by default and can be activated manually based on the particular mail security policy that the organization wants to implement. If you have anti-spoofing enabled and the SPF record: hard fail ( MarkAsSpamSpfRecordHardFail) turned on, you will probably get more false positives. is required for every domain and subdomain to prevent attackers from sending email claiming to be from non-existent subdomains. Secondly, if your user has the sender's address added to their safe senders list, or sender address is in contacts + contacts are trusted, the message would skip spam filtering and be delivered to inbox. For example: Once you've formulated your SPF TXT record, follow the steps in Set up SPF in Microsoft 365 to help prevent spoofing to add it to your domain. Microsoft maintains a dynamic but non-editable list of words that are associated with potentially offensive messages. This can be one of several values. - last edited on The condition part will activate the Exchange rule when the combination of the following two events will occur: In phase 1 (the learning mode), we will execute the following sequence of actions: This phase is implemented after we are familiar with the different scenarios of Spoof mail attacks. In the current article, I want to provide you with a useful way, to implement a mail security policy related to an event in which the result of the SPF sender verification check is Fail. If we want to be more precise, an event in which the SPF sender verification test result is Fail, and the sender used the E-mail address, which includes our domain name. A hard fail, for example, is going to look like this: v=spf1 ip4 192.xx.xx.xx -all If mail is being sent from another server that's not the IP in the SPF, the receiving server will discard it. Enabling one or more of the ASF settings is an aggressive approach to spam filtering. To be able to use the SPF option we will need to implement by ourselves the following proceeds: Add to the DNS server that hosts our domain name the required SPF record, and verifies that the syntax of the SPF record is correct + verify that the SPF record includes information about all the entities that send an E-mail message on behalf of our domain name. To fix this issue, a sender rewriting scheme is being rolled out in Office 365 that will change the sender email address to use the domain of the tenant whose mailbox is forwarding the message. Phishing emails Fail SPF but Arrive in Inbox Posted by enyr0py 2019-04-23T19:01:42Z. However, over time, senders adjusted to the requirements. Another distinct advantage of using Exchange Online is the part which enables us to select a very specific response (action), that will suit our needs such as Perpend the E-mail message subject, Send warning E-mail, send the Spoof mail to quarantine, generate the incident report and so on. This is the default value, and we recommend that you don't change it. In case we want to get more information about the event or in case we need to deliver the E-mail message to the destination recipient, we will have the option. Use the 90-day Defender for Office 365 trial at the Microsoft 365 Defender portal trials hub. Destination email systems verify that messages originate from authorized outbound email servers. Suppose a phisher finds a way to spoof contoso.com: Since IP address #12 isn't in contoso.com's SPF TXT record, the message fails the SPF check and the receiver may choose to mark it as spam. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); LazyAdmin.nl is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. For example: Previously, you had to add a different SPF TXT record to your custom domain if you were using SharePoint Online. Each include statement represents an additional DNS lookup. ip4 indicates that you're using IP version 4 addresses. Even in a scenario in which the mail infrastructure of the other side support SPF, in case that the SPF verification test marked as Fail, we cannot be sure that the spoofed E-mail will be blocked. Also, if you're using DMARC with p=quarantine or p=reject, then you can use ~all. ip4: ip6: include:. Take a look at the basic syntax for an SPF rule: For example, let's say the following SPF rule exists for contoso.com: v=spf1 . In this step, we want to protect our users from Spoof mail attack. Typically, email servers are configured to deliver these messages anyway. This is reserved for testing purposes and is rarely used. You will also need to watch out for the condition where you SPF record contains more than 10 DNS lookups, and take action to fix it when it happens. In simple words, the destination recipient is not aware of a scenario in which the SPF result is Fail, and they are not aware of the fact that the E-mail message could be a spoofed E-mail. You will first need to identify these systems because if you dont include them in the SPF record, mail sent from those systems will be listed as spam. For more information, see Advanced Spam Filter (ASF) settings in EOP. Scenario 1 the sender uses an E-mail address that includes a domain name of a well-known organization. Setting up DMARC for your custom domain includes these steps: Step 1: Identify valid sources of mail for your domain. When this setting is enabled, any message that hard fails a conditional Sender ID check is marked as spam. This record probably looks like this: If you're a fully hosted customer, that is, you have no on-premises mail servers that send outbound mail, this is the only SPF TXT record that you need to publish for Office 365. For example, the company MailChimp has set up servers.mcsv.net. SPF works best when the path from sender to receiver is direct, for example: When woodgrovebank.com receives the message, if IP address #1 is in the SPF TXT record for contoso.com, the message passes the SPF check and is authenticated. If you go over that limit with your include, a-records an more, mxtoolbox will show up an error! In order to use a custom domain, Office 365 requires that you add a Sender Policy Framework (SPF) TXT record to your DNS record to help prevent spoofing. Sender Policy Framework (SPF) allows email administrators to reduce sender-address forgery (spoofing) by specifying which are allowed to send email for a domain. (Yahoo, AOL, Netscape), and now even Apple. Office 365 supports only one SPF record (a TXT record that defines SPF) for your domain. (e.g., domain alignment for SPF); d - send only if DKIM fails; s - send only when SPF fails. Office 365 supports only one SPF record (a TXT record that defines SPF) for your domain. Keep in mind, that SPF has a maximum of 10 DNS lookups. ip6 indicates that you're using IP version 6 addresses. SPF is added as a TXT record that is used by DNS to identify which mail servers can send mail on behalf of your custom domain. The E-mail address of the sender uses the domain name of a well-known bank. What happens to the message is determined by the Test mode (TestModeAction) value: The following Increase spam score ASF settings result in an increase in spam score and therefore a higher chance of getting marked as spam with a spam confidence level (SCL) of 5 or 6, which corresponds to a Spam filter verdict and the corresponding action in anti-spam policies. A soft fail would look like this: v=spf1 ip4 192.xx.xx.xx ~all Test mode is not available for the following ASF settings: Microsoft 365 organizations with Exchange Online mailboxes. Solution: Did you try turning SPF record: hard fail on, on the default SPAM filter? Scenario 2 the sender uses an E-mail address that includes. For tips on how to avoid this, see Troubleshooting: Best practices for SPF in Microsoft 365. The E-mail is a legitimate E-mail message. Some services have other, more strict checks, but few go as far as EOP to block unauthenticated email and treat them as spoofed messages. Use the step-by-step instructions for updating SPF (TXT) records for your domain registrar. In some cases, like the salesforce.com example, you have to use the domain in your SPF TXT record, but in other cases, the third-party may have already created a subdomain for you to use for this purpose. A typical SPF TXT record for Microsoft 365 has the following syntax: text v=spf1 [<ip4>|<ip6>:<IP address>] [include:<domain name>] <enforcement rule> For example: text v=spf1 ip4:192.168..1 ip4:192.168..2 include:spf.protection.outlook.com -all where: v=spf1 is required. IP address is the IP address that you want to add to the SPF TXT record. Vs. this scenario, in a situation in which the sender E-mail address includes our domain name, and also the result from the SPF sender verification test is fail, this is a very clear sign of the fact that the particular E-mail message has a very high chance to consider as Spoof mail. A9: The answer depends on the particular mail server or the mail security gateway that you are using. In case you wonder why I use the term high chance instead of definite chance is because, in reality, there is never 100% certainty scenario. Also, if your custom domain does not have an SPF TXT record, some receiving servers may reject the message outright. Also, the original destination recipient will get an E-mail notification, which informs him that a specific E-mail message that was sent to him was identified as Spoof mail and for this reason didnt automatically send to his mailbox. Do nothing, that is, don't mark the message envelope. For example, create one record for contoso.com and another record for bulkmail.contoso.com. Messages that contain web bugs are marked as high confidence spam. A great toolbox to verify DNS-related records is MXToolbox. This tool checks your complete SPF record is valid. If you are a small business, or are unfamiliar with IP addresses or DNS configuration, call your Internet domain registrar (ex. In this example, the SPF rule instructs the receiving email server to only accept mail from these IP addresses for the domain contoso.com: This SPF rule tells the receiving email server that if a message comes from contoso.com, but not from one of these three IP addresses, the receiving server should apply the enforcement rule to the message. Messages that hard fail a conditional Sender ID check are marked as spam. SPF identifies which mail servers are allowed to send mail on your behalf. Messages that contain numeric-based URLs (typically, IP addresses) are marked as spam. In reality, most of the organization will not implement such a strict security policy because they would prefer to avoid a false-positive scenario in which a legitimate mail mistakenly identified as Spoof mail. Messages sent from Microsoft 365 to a recipient within Microsoft 365 will always pass SPF. Instead, the E-mail message will be forwarded to a designated authority, such as IT person, that will get the suspicious E-mail, and this person will need to carefully examine the E-mail and decide if the E-mail is indeed spoofed E-mail or a legitimate E-mail message that mistakenly identified as Spoof mail. A8: The responsibility of the SPF mechanism is to stamp the E-mail message with the SPF sender verification test results. For example: Having trouble with your SPF TXT record? Although there are other syntax options that are not mentioned here, these are the most commonly used options. Its a good idea to configure DKIM after you have configured SPF. Go to Create DNS records for Office 365, and then select the link for your DNS host. Given that we are familiar with the exact structure of our mail infrastructure, and given that we are sure that our SPF record includes the right information about our mail servers IP address, the conclusion is that there is a high chance that the E-mail is indeed spoofed E-mail! office 365 mail SPF Fail but still delivered, Re: office 365 mail SPF Fail but still delivered. This is no longer required. While there was disruption at first, it gradually declined. The reason for the outcome of SPF = Fail is related to a missing configuration on the sending mail infrastructure., The E-mail address of the sender, uses the domain name of, The result from the SPF sender verification test is , The popular organization users who are being attacked, The various types of Spoofing or Phishing attacks, The E-mail address of the sender includes our domain name (in our specific scenario; the domain name is, The result of the SPF sender verification check is fail (SPF = Fail). If an email message causes more than 10 DNS lookups before it's delivered, the receiving mail server will respond with a permanent error, also called a permerror, and cause the message to fail the SPF check. See You don't know all sources for your email. If you have a hybrid environment with Office 365 and Exchange on-premises. In the next article, Implementing SPF Fail policy using Exchange Online rule (dealing with Spoof E-mail attack) | Phase 1 learning mode | Part 2#3, we will review the step-by-step instruction needed to create an Exchange Online rule that will help us to monitor such events. If the sender isn't permitted to do so, that is, if the email fails the SPF check on the receiving server, the spam policy configured on that server determines what to do with the message. Can we say that we should automatically block E-mail message which their organization doesnt support the use of SPF? This option enables us to activate an EOP filter, which will mark incoming E-mail message that has the value of SFP =Fail as spam mail (by setting a high SCL value). Messages that contain hyperlinks that redirect to TCP ports other than 80 (HTTP), 8080 (alternate HTTP), or 443 (HTTPS) are marked as spam. Now that Enhanced Filtering for Connectors is available, we no longer recommended turning off anti-spoofing protection when your email is routed through another service before EOP. This change should reduce the risk of SharePoint Online notification messages ending up in the Junk Email folder. As you can see in the screenshot below, Microsoft has already detected an existing SPF record, marking it invalid.We can safely add include:spf.protection.outlook.com to our SPF record.In your DNS Hosting Provider, look up the SPF record, and click edit. Add include:spf.protection.outlook.com before the -all elementSo in this case it would be:v=spf1 ip4:213.14.15.20 include:servers.mcsv.net include:spf.protection.outlook.com -all. Mark the message with 'hard fail' in the message envelope and then follow the receiving server's configured spam policy for this type of message. For example, we are reasonable for configuring SPF record that will represent our domain and includes the information about all the mail server (the Hostname or the IP address) that can send E-mail on behalf of our domain name. Your email address will not be published. Add SPF Record As Recommended By Microsoft. So only the listed mail servers are allowed to send mail, A domain name that is allowed to send mail on behalf of your domain, Ip address that is allowed sending mail on behalf of your domain, ip4:21.22.23.24 or complete range: ip4:20.30.40.0/19, Indicates what to do with mail that fails, Sending mail for on-premise systems public IP Address 213.14.15.20, Sending mail from MailChimp (newsletters service). If you have any questions, just drop a comment below. For example, suppose the user at woodgrovebank.com has set up a forwarding rule to send all email to an outlook.com account: The message originally passes the SPF check at woodgrovebank.com but it fails the SPF check at outlook.com because IP #25 isn't in contoso.com's SPF TXT record. You add an SPF TXT record that lists the Office 365 messaging servers as legitimate mail servers for your domain. But it doesnt verify or list the complete record. To work around this problem, use SPF with other email authentication methods such as DKIM and DMARC. My opinion that blocking or rejecting such E-mail messages is too risky because, we cannot enforce other organizations to use SPF, although using SPF is recommended and help to protect the identity and the reputation of a particular domain. These are added to the SPF TXT record as "include" statements. Generate and Send an incident report to a designated recipient (shared mailbox) that will include information about the characters of the event + the original E-mail message. If you don't use a custom URL (and the URL used for Office 365 ends in onmicrosoft.com), SPF has already been set up for you in the Office 365 service. In this phase, we will need to decide what is the concrete action that will apply for a specific E-mail message that will identify a Spoof mail (SPF = Fail). Below is an example of adding the office 365 SPF along with onprem in your public DNS server. If you have anti-spoofing enabled and the SPF record: hard fail (MarkAsSpamSpfRecordHardFail) turned on, you will probably get more false positives. In reality, the recipient will rarely access data stored in the E-mail message header, and even if they access the data, they dont have the ability to understand most of the information thats contained within the E-mail header. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. We recommend the value -all. This type of scenario, there is a high chance that we are experiencing a Spoof mail attack! One option that is relevant for our subject is the option named SPF record: hard fail. Jun 26 2020 In addition to IP addresses, you can also configure your SPF TXT record to include domains as senders. The number of messages that were misidentified as spoofed became negligible for most email paths. Domain names to use for all third-party domains that you need to include in your SPF TXT record. When it finds an SPF record, it scans the list of authorized addresses for the record. We recommend that you use always this qualifier. Login at admin.microsoft.com Navigate to your domain - Expand Settings and select Domains - Select your custom Domain (not the <companyname>.onmicrosoft.com domain Lookup the SPF Record Click on the DNS Records tab. For questions and answers about anti-spam protection, see Anti-spam protection FAQ. Note: MailRoute will automatically recognize that you are using Office 365 for your outbound service, so you do not need to enter an outbound mailserver in the MailRoute Control Panel. Export the content of Exchange mailbox Recoverable items folder to PST using the Office 365 content search | Step by step guide | 2#3, Detect spoof E-mail and mark the E-mail as spam using Exchange Online rule | Part 4#12, Connecting users to their Exchange Online mailbox Stage migration solving the mystery | Part 2#2 | Part 36#36. A typical SPF TXT record for Microsoft 365 has the following syntax: v=spf1 is required. Read the article Create DNS records at any DNS hosting provider for Microsoft 365 for detailed information about usage of Sender Policy Framework with your custom domain in Microsoft 365. ASF specifically targets these properties because they're commonly found in spam. This option enables us to activate an EOP filter, which will mark incoming E-mail message that has the value of "SFP =Fail" as spam mail (by setting a high SCL value). @tsulafirstly, this mostly depends on the spam filtering policy you have configured. Enforcement rule is usually one of the following: Indicates hard fail. The second one reads the "Authentication-Results" line in the header information and if it says "Fail" sends the email to quarantine. A10: To avoid a scenario of false-positive meaning, a scene in which legitimate E-mail will mistakenly identify as a Spoof mail. Oct 26th, 2018 at 10:51 AM. Authentication-Results: spf=none (sender IP is 118.69.226.171) smtp.mailfrom=kien.ngan; thakrale5.onmicrosoft.com; dkim=none (message not signed) header.d=none;thakrale5.onmicrosoft.com; dmarc=none action=none header.from=thakrale5.onmicrosoft.com; Received-SPF: None (protection.outlook.com: kien.ngan does not designate permitted sender hosts) However, anti-phishing protection works much better to detect these other types of phishing methods. Add a new Record Select Type: TXT Name/Host: @ Content/Value: v=spf1 include:spf.protection.outlook.com -all (or copy paste it from Microsoft 365 ( step 4 )) Click SaveContinue at Step 8, If you already have an SPF record, then you will need to edit it. The enforcement rule is usually one of these options: Hard fail. Gather the information you need to create Office 365 DNS records, Troubleshooting: Best practices for SPF in Office 365, How SPF works to prevent spoofing and phishing in Office 365, Common. If you don't have a deployment that is fully hosted in Microsoft 365, or you want more information about how SPF works or how to troubleshoot SPF for Microsoft 365, keep reading. For example, if you are hosted entirely in Office 365, that is, you have no on-premises mail servers, your SPF TXT record would include rows 1, 2, and 7 and would look like this: The example above is the most common SPF TXT record. We . You then define a different SPF TXT record for the subdomain that includes the bulk email. We can certainly give some hints based on the header information and such, but it might as well be something at the backend (like the changes which caused the previous "incident"). LazyAdmin.nl is compensated for referring traffic and business to these companies at no expense to you. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I always try to make my reviews, articles and how-to's, unbiased, complete and based on my own expierence. Anti-spoofing protection considers both SPF hard fails and a much wider set of criteria. From my experience, the phase is fascinating because after we activate the monitor process, we will usually find an absorbing finding of: Based on this information, we will be able to understand the real scope of the problem, the main characters of this attack and so on. Received-SPF: Fail ( protection.outlook.com: domain of ourdomain1.com does not designate X .X.X.X as permitted sender) We have SPF for our domain v=spf1 include:spf.protection.outlook.com -all We have also enable that fail SPF email should not get in our admin centre. The most important purpose of the learning/inspection mode phase is to help us to locate cracks and grooves in our mail infrastructure. The SPF mechanism doesnt perform and concrete action by himself. i check headers and see that spf failed. If all of your mail is sent by Microsoft 365, use this in your SPF TXT record: In a hybrid environment, if the IP address of your on-premises Exchange Server is 192.168.0.1, in order to set the SPF enforcement rule to hard fail, form the SPF TXT record as follows: If you have multiple outbound mail servers, include the IP address for each mail server in the SPF TXT record and separate each IP address with a space followed by an "ip4:" statement. We do not recommend disabling anti-spoofing protection. Misconception 1: Using SPF will protect our organization from every scenario in which hostile element abuses our organizational identity. For example, if you are hosted entirely in Office 365 Germany, that is, you have no on-premises mail servers, your SPF TXT record would include rows 1, 4, and 7 and would look like this: If you're already deployed in Office 365 and have set up your SPF TXT records for your custom domain, and you're migrating to Office 365 Germany, you need to update your SPF TXT record. The receiving server may also respond with a non-delivery report (NDR) that contains an error similar to these: Some SPF TXT records for third-party domains direct the receiving server to perform a large number of DNS lookups. What is SPF? This is the scenario in which we get a clear answer regarding the result from the SPF sender verification test the SPF test fail! For information about the domains you'll need to include for Microsoft 365, see External DNS records required for SPF. Q5: Where is the information about the result from the SPF sender verification test stored? Great article. If you set up mail when you set up Microsoft 365, you already created an SPF TXT record that identifies the Microsoft messaging servers as a legitimate source of mail for your domain. The rest of this article uses the term SPF TXT record for clarity. This ASF setting is no longer required. The reason that I prefer the option of Exchange rule is, that the Exchange rule is a very powerful tool that can be used to define a Tailor-made SPF policy that will suit the specific structure and the needs of the organization. An SPF TXT record is a DNS record that helps prevent spoofing and phishing by verifying the domain name from which email messages are sent. The only thing that we can do is enable other organizations that receive an email message that has our domain name, the ability to verify if the E-mail is a legitimate E-mail message or not. Add a predefined warning message, to the E-mail message subject. Its Free. More info about Internet Explorer and Microsoft Edge.
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