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I am relatively new to sendmail. When I tried to send mail, I got the following in my log:

sendmail[3660]: My unqualified host name (DynusT) unknown; sleeping for retry
sendmail[3660]: unable to qualify my own domain name (DynusT) -- using short name

I did some research on the net and it seems that it has to do with the hostname, so here's my etc/hosts:

127.0.0.1 localhost
127.0.1.1 DynusT.local. DynusT
50.56.81.42 domain1.com
50.56.81.42 domain2.com

How do I fix this issue?

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I was looking into adjusting the config on one of my sendmail servers today and bumped into this article. After following it, it did the trick for me. I had a similar issue.

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mind sharing your var/hosts? might help me fix this issue – EquinoX Apr 14 '11 at 20:11
# Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6 10.1.6.1 servername servername.domain.loc. – Vick Vega Apr 14 '11 at 20:16
You should be looking into your sendmail config as a first step, I would suggest. – Vick Vega Apr 14 '11 at 20:17
I changed it to 127.0.0.1 mydomain localhost and it works... not sure why mine doesn't work with 127.0.0.1 localhost.localdomain localhost... any ide? – EquinoX Apr 14 '11 at 21:16
The reason is probably because in sendmail config you have localhost.localdomain define. Google - "sendmail linux config" – Vick Vega Apr 15 '11 at 13:44
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