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Detect illegal UTF-8 encoded headers

Postfix policy service that does rate limiting for senders

SOGo docker image

Detect illegal UTF-8 encoded headers

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.

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

DKIM key management for keys stored in OpenLDAP

Authserv is a central authentication server that uses different databases as backends to verify user credentials. The communication between clients and server is based on HTTP.

It also can serve additional information up to a successful user lookup.