Whitelist a Domain in Office 365 with Mail flow rules That is why mail flow rules are the recommended way to whitelist a domain. Because when filtering simply on a domain name alone, you also set the door open for spoofed phishing mails for that domain. When it comes to excluding a domain from spam filtering, itвЂ™s important to be as specific as possible about the source. Other options are to whitelist on IP Address in Office 365 or use the safe sender list in Outlook. The two most common ways to whitelist a domain on a tenant level are by either using a mail flow rule (recommended) or by adding the domain to the allowed sender list in de anti-spam policy. It can be that itвЂ™s sent from an untrusted source, failed the SPF or DMARC check, or even based on the content of the email. There are various reasons why an email is marked as spam. There are multiple ways to whitelist a domain in Office 365, but itвЂ™s important that you understand the implication of the different methods. In this article, we are going to take a look at the different options to whitelist a domain in Office 365.

But when emails from trusted senders are marked as spam we need to find a way to override this and safely deliver the mail into the userвЂ™s inbox. This is of course unwanted, so how do you whitelist a domain in Office 365? And how can we do it safely without opening the doors for phishing emails?ДЇiltering out spam emails is important to prevent malware and phishing emails from ending up in your userвЂ™s mailboxes. Sometimes legitimate email ends up in the junk folder after being marked as spam by Exchange Online.

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