Hey,

I noticed that the RecipientValidator does not allow postmaster addresses if there is no explicit user / alias for it. As emails to the postmaster address are already rejected after the RCPT TO command, the PostmasterAlias mailet is useless when using the RecipientValidator. As the postmaster address is mandated in RFC 5321 (https://www.rfc-editor.org/info/rfc5321/#section-4.5.1), I would propose to add an exception for it in the RecipientValidator.
If that's okay with everybody, I am happy to open a PR for this.

Best regards,
Felix

--
Gesellschaft für Interkulturelles Zusammenleben gGmbH (GIZ)
Felix Auringer (he/him)
Softwareentwickler

Reformationsplatz 2
13597 Berlin

Tel: -; Fax: +4930513010009
www.giz.berlin; [email protected]

Amtsgericht Charlottenburg HRB 200872 B
Geschäftsführerin: Dr. Britta Marschke

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