Remote Server returned '< #4.7.6 smtp; 451 4.7.6 [internal] STARTTLS required but not advertised>'

Florian Bauer

Member
Nov 7, 2017
10
2
6
39
Hallo zusammen,

seit ca 2 Wochen bekommen wir von einer anderen Maildomaine, ext. Kunde die Emails zum Teil nicht.
Wir haben nun nachgeforscht um eine Fehlermeldung zu bekommen, diese beinhaltet:

emailadresse@unseredomain.at
Remote Server returned '< #4.7.6 smtp; 451 4.7.6 [internal] STARTTLS required but not advertised>'

-> Remote-Server wäre hier der Proxmox, welche die Mails annimmt.

Kennt ihr das Problem?

Liebe Grüße
Florian
 
Ist TLS am Proxmox Mail Gateway aktiviert?
(Configuration/Mail Proxy/TLS)
 

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