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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

Detect illegal UTF-8 encoded headers

S/MIME signing milter

SMIMEA Milter

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.

SOGo docker image

Avira SAVAPI command line client

Detect illegal UTF-8 encoded headers

A quarantine for rspamd using SQL as backend

Zabbix template to monitor many common mailserver services

Generate spamassassin and rspamd daily reports for used rules

Postfilx milter that rejects/fixes manipulated From:-header

This is a set of OpenLDAP schema files

DKIM key management for keys stored in OpenLDAP