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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.

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.

Detect illegal UTF-8 encoded headers

Postfix policy service that checks a users mailbox quota flag from HTTP or LDAP

Postfix policy service that does rate limiting for senders

Detect illegal UTF-8 encoded headers