This article explains how to configure SpamAssassin to always allow certain senders.
How to add a user's email address and domain to the Safe Senders List 365 Admin Center Anti-Spam Policy
Using its extensive set of rules and Bayesian analysis, SpamAssassin catches an impressive amount of spam with hardly any false positives — hardly any. To reduce this number even further, you can, for example, safelist certain newsletters, which are often the best candidates for being falsely classified as spam.
To add individual addresses or domains to SpamAssassin's safe list:
Open /etc/mail/spamassassin/local.cf in your favorite system-wide safelist editor.
