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Check the envelope-from address and compare it to the header From:-address. Reject mails, if both addresses do not match

Detect illegal UTF-8 encoded headers

Postfix policy service that does rate limiting for senders

A quarantine for rspamd using SQL as backend

DKIM key management for keys stored in OpenLDAP

Postfilx milter that rejects/fixes manipulated From:-header

SOGo docker image

Detect illegal UTF-8 encoded headers