https://community.bt.com/t5/Archive-Staging/Mail-issue-from-this-forum/m-p/2196981#M1258141 <P>Hello,</P><P>&nbsp;</P><P>Just an FYI for your IT department - you must have a misconfigured mail server, since the emails being sent to users are getting caught up by postfix's "reject_unknown_domain". You must have many users not receiving their emails.</P><P>&nbsp;</P><P>reject: RCPT from outbound-dkim.eu.khoros-mail.com[34.255.61.190]: 450 4.1.8 &lt;no-reply@community-mail.bt.com&gt;: Sender address rejected: Domain not found; from=&lt;no-reply@community-mail.bt.com&gt; to=&lt;****recepientemailaddresswashere****&gt; proto=ESMTP helo=&lt;outbound-dkim.eu.khoros-mail.com&gt;</P> Thu, 25 Nov 2021 16:10:38 GMT Eeyoree 2021-11-25T16:10:38Z https://community.bt.com/t5/Archive-Staging/Mail-issue-from-this-forum/m-p/2196981#M1258141 <P>Hello,</P><P>&nbsp;</P><P>Just an FYI for your IT department - you must have a misconfigured mail server, since the emails being sent to users are getting caught up by postfix's "reject_unknown_domain". You must have many users not receiving their emails.</P><P>&nbsp;</P><P>reject: RCPT from outbound-dkim.eu.khoros-mail.com[34.255.61.190]: 450 4.1.8 &lt;no-reply@community-mail.bt.com&gt;: Sender address rejected: Domain not found; from=&lt;no-reply@community-mail.bt.com&gt; to=&lt;****recepientemailaddresswashere****&gt; proto=ESMTP helo=&lt;outbound-dkim.eu.khoros-mail.com&gt;</P> Thu, 25 Nov 2021 16:10:38 GMT https://community.bt.com/t5/Archive-Staging/Mail-issue-from-this-forum/m-p/2196981#M1258141 Eeyoree 2021-11-25T16:10:38Z