>I have some mailing lists that I have started to get postmaster emails from
>stating that it can not reach certain users.
IMail always reports "Unknown user" if a mailserver rejects your E-mail, no
matter what the reason. So "Unknown user" may mean "No such user here",
"That user can't accept mail; their mailbox is full", or even "Your mail is
rejected since you are listed in DORKZTL and DSBL and XBL". So IMail users
often don't know that they are listed in spam databases.
You might want to check the IMail SMTP log file for the date/time you sent
the message, and see what it says after the "RCPT TO:" line.
-Scott
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