Issue

E-mail bounced back with following error message when sending mails to some domains.

553 sorry, that domain isn't in my list of allowed rcpthosts

The following message was seen in maillog at the same time.

<span id="UpdateSR"><span id="SRDetailsSubTabRN"><span id="SRHistoryTabxRN"><span id="SRLogxRN"><span id="ActivityTextFLRN_6__95"><span class="x4" id="NoteDetailText_2__95">Nov 12 09:05:36 mailrelay sendmail[9796]: nACH5X05009789:to=<xxx@xxx.com>, delay=00:00:03, xdelay=00:00:01,<br />mailer=esmtp, pri=98903, relay=mail.xxx.com. [xx.xxx.xxx.xxx],dsn=5.1.3, stat=User unknown</span></span></span></span></span></span>

Nslookup for xxx.com resolves fine.