DKIMproxy is an SMTP-proxy that signs and/or verifies emails, using the Mail::DKIM module. It is designed for Postfix, but should work with any mail server. It comprises two separate proxies, an "outbound" proxy for signing outgoing email, and an "inbound" proxy for verifying signatures of incoming email. With Postfix, the proxies can operate as either Before-Queue or After-Queue content filters.
Tips für Postfix, wenn er zuviele Anfragen bekommt und die Abarbeitung zu lange dauert
Verschiedene Verfahren um selektiv postfix + amavis Spam checks auszuschalten
