Never put common domains, such as and, onto the Allow and blocklists.

Never put domains that you own onto the Allow and blocklists.

It's important that you take the following precautions:

This is because spam filters can evolve, and verdicts could improve over time. Additionally, bypassing should be done only on a temporary basis. If you have to set bypassing, you should do this carefully because Microsoft will honor your configuration request and potentially let harmful messages pass through. Instead, we suggest that you report junk email messages to Microsoft for analysis to help reduce the number and effect of future junk email messages. We recommend that you don't use these features because they may override the verdict that is set by Office 365 spam filters. If you use these lists or options, consider the following guidelines: Enable Safe and Blocked senders in Outlook or Outlook on the Web.

Enable Allow or block lists in Spam Filter policies.This article applies to both users and administrators who do the following: This article discusses why you shouldn't bypass spam filters in Microsoft Office 365.

Microsoft spam filter outlook