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Postfix IPv6 Unauthorized Mail Relay Vulnerability

Postfix is prone to a vulnerability that allows the application to be abused as a mail relay.

Arbitrary mail may be sent to any MX host with an IPv6 address. This could be exploited by spammers or other malicious parties.

Postfix 2.1.3 is reported prone to this issue. It is possible that other versions are affected as well.