We have ubuntu 12.04 server and installed sendmail to send mails from this server.


There is some strange issue on mail server. Somehow, server not able to send email to xxx@ayolla.com

but server sends email successfully to other email ids like xxx@spaceotechnologies.com, xxx@gmail.com or xxx@yahoo.com.

Success Case: when send email to xxx@spaceotechnologies.com

Dec 28 11:40:49 ip-10-99-66-252 sm-mta[16954]: qBSBemdx016952: to=, ctladdr= (33/33), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120352, relay=aspmx.l.google.com. [], dsn=2.0.0, stat=Sent (OK 1356694874 d3si34930711vdv.119) Dec 28 11:51:43 ip-10-99-66-252 sendmail[16960]: qBSBphki016960: from=www-data, size=89, class=0, nrcpts=1, msgid=<201212281151.qBSBphki016960@ayolla.com>, relay=www-data@localhost

Fail Case: when send email to xxx@ayolla.com

Dec 28 11:51:43 ip-10-99-66-252 sm-mta[16962]: qBSBphSo016962: ... User unknown Dec 28 11:51:43 ip-10-99-66-252 sendmail[16960]: qBSBphki016960: to=info@ayolla.com, ctladdr=www-data (33/33), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30089, relay=[] [], dsn=5.1.1, stat=User unknown

Can someone please help to sort out this issue ?

Note: I don't want to expose our emails that's why i replaced xxx with original email address into this question.


The user unknown message means info is not a valid user at the domain ayolla.com.

This is a permanent error and not something you can fix, as the email address (recipient) is rejected by this mail server.

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