[SATLUG] Fwd: Undelivered Mail Returned to Sender

[Daniel J. Givens]

Brad Knowles wrote:
> Folks,
> 
> Can someone explain to me how broken a mail system has to be in order to
> generate this kind of a bounce?

No broken-ness. It looks like the server didn't like that your mail which says
it's from shub-internet.org is coming from his.com. Sender/source domain mismatch.

This is a defensive tactic used to keep spammers from sending mail via some
zombie and saying they're from paypal.com, or something else.