I have two hosting accounts,
companydomain.com. Both have User level cPanel. Whenever I try to send email from
personaldomain.com to any email address on
companydomain.com, I instantly receive a Mail Delivery System message saying:
Subject: **Mail delivery failed: returning message to sender** A message that you send could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: email@example.com No Such User Here
This only happens from
companydomain.com, and not the other way. I've tried each address, and looking at the headers, it doesn't seem to be leaving my mail server:
Received: from ns1.usm4.siteground.biz ([my-ip-address] helo=mymailserver1.usm4.siteground.biz) by se8.mailspamprotection.com with esmtps (TLSv1.2:DHE-RSA-AES256-SHA:256) (Exim 4.85) (envelope-from <firstname.lastname@example.org>) id 1aYcMc-0003NN-Qz for email@example.com; Wed, 24 Feb 2016 10:32:37 -0600 Received: from localhost ([127.0.0.1]:38882 helo=mymailserver.usm4.siteground.biz) by mymailserver1.usm4.siteground.biz with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.80.1) (envelope-from <firstname.lastname@example.org>) id 1aYcMc-0007Zf-Lg for email@example.com; Wed, 24 Feb 2016 11:32:34 -0500 Received: from an-ip-address ([an-ip-address]) by mysubserver.sgcpanel.com (Horde Framework) with HTTP; Wed, 24 Feb 2016 16:32:34 +0000 Date: Wed, 24 Feb 2016 16:32:34 +0000 [more content headers and filters] X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: Combined (0.29) X-Recommended-Action: accept
I also noticed that the returned emails have a time of 4:32am when my server is 11:32am EST (sending from Webmail Horde) and my local time is 10:32am (sending from Outlook or iPhone). I don't know if that affects the authentication.
I'm able to send to
companydomain.com from any other email address. I'm able to send to any other domain from
How can I figure out the source of this error, so I can fix it?