Verify postfix spam checks

CentOS Infra issue/request

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Issue Type

Issue - problem with something that was working
[] Feature Request - something you'd like us to add/modify/change
[] Task - mostly used by CentOS Infra team for day-to-day operations or bigger plans

Description

Some users reported through Matrix that when they try to send mail to mailing-lists, some are now rejected/blocked at the postfix/smtpd level.

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