is the sender - or receiving system - at fault for this error?
I've built a dovecot/MailScanner (postfix)/postgrey server over the past year or so, everything's going fine EXCEPT...
when one particular sender attempts to mail one of my users, it bounces with this:
Perhaps the sender's address isn't configured properly? something wrong with her headers? Or is there something wrong with my system?
Since others can send to the address, the address exists rather than what the error message is telling you.
However, the fact that you get the message says that the target mail server is not reporting that the address exists when YOUR messages are presented for delivery. In short, you knock on their door, but get "no one by that name lives here."
This sounds like a "white list" -- "black list" issue to me. (Others with more mail server admin knowledge might be able to say better or more accurately.) In short, something about YOUR message, as sender, is not acceptable to their servers. White and black lists are security measures to combat spam and other email based scum-ware attacks. These lists might affect only email, but might also affect access to web pages or other internet services.
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