I have Imail server 7.13 and can not send mail to a particular domain hiwaay.net I have contacted them and they use sendmail 8.12 I can query the MX records for the domain which return
Their MX records are OK.
What do the logs say? Are you telneting from the same IP as the mailserver, and using the same return address? Most likely, they have blocked you for some reason.I get a user unknown return message but, I can connect to hiwaay.com on port 25 and send the message directly to the user account.
Hopefully, a future release of IMail will give the reason that the mail was rejected, rather than the generic "User unknown".
-Scott
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