On 14 Apr 2020, at 11:42, Rick King <rk...@zimbra.com> wrote:
> We were thinking using a header_check rule, something like this; but didn't
> work due to the "backtracking limit exceeded" warning.
The From: header is entirely valid, and the issue is the user’s MUA is not
showing the full header (in an effort to be ‘helpful” I assume).
> /^From:(.*)*\<*@*\> \<*@*\>/ REJECT #Sorry, we do not allow emails with
> multiple FROM senders
Maybe something like this:
/^From:[^<]+<[^@]+[^>]+>.*</
Basically, you are looking for a <something@soemthing> followed by another <,
but I predict you will lose a lot of legitimate mail this way. I see quite a
few matches in my mail.
--
"He has never been known to use a word that might send a reader to
the dictionary." - William Faulkner (about Ernest Hemingway).
