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Postfix-Submission policy server that checks sender IPs and blocks senders, if they come from different countries or if they come from too many different IP addresses.

DKIM key management for keys stored in OpenLDAP

Detect illegal UTF-8 encoded headers

Detect illegal UTF-8 encoded headers

SOGo docker image

Postfix policy service that does rate limiting for senders

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