Timo Veith:
> 2012/6/28 Wietse Venema <[email protected]>:
> > Timo Veith:
> >> that rejects messages in the smtp dialogue if the envelope recipient
> >> is unknown.
I answered that question, even though it was not about Postfix.
> I have not found a way to reject a message with
> a bad rcpt address based on invalid dns / mx. records.
Along with my answer, I also showed you how to query a popular
search engine for questions about Sendmail.
I suggest that you read the first "hit" for
sendmail reject unknown "domain"
(follow the link to www.hansenonline.net, read the last paragraph).
Wietse