[Postfixbuch-users] Mails an nicht-existente Subdomains abweisen

[Uwe Driessen]

On Behalf Of Torben
> 
> Das Ergebnis ist unveraendert: er nimmt die Mails an und schickt sie
> mit Fehlermeldung 450 an den Absender zurueck, dieser schickt nach 10
> Minuten erneut, Postfix weisst sie wieder mit 450 ab, ....
> 

450 ist die Standard Einstellung 

Setz einen 550

reject_unverified_recipient 
Reject the request when mail to the RCPT TO address is known to bounce, or when the
recipient address destination is not reachable. Address verification information is
managed by the verify(8) server; see the ADDRESS_VERIFICATION_README file for details. 

The unverified_recipient_reject_code parameter specifies the response when an address is
known to bounce (default: 450, change into 550 when you are confident that it is safe to
do so). The unverified_recipient_defer_code parameter specifies the response when an
address probe failed due to a temporary problem (default: 450). This feature is available
in Postfix 2.1 and later. 
Other restrictions that are valid in this context: 

Generic restrictions that can be used in any SMTP command context, described under
smtpd_client_restrictions. 
SMTP command specific restrictions described under smtpd_client_restrictions,
smtpd_helo_restrictions and smtpd_sender_restrictions. 
Example: 

smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination



unknown_address_reject_code (default: 450)
The numerical Postfix SMTP server response code when a sender or recipient address is
rejected by the reject_unknown_sender_domain or reject_unknown_recipient_domain
restriction. The response is always 450 in case of a temporary DNS error. 

Do not change this unless you have a complete understanding of RFC 2821. 





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