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Sendmail Configuration Help

Posted on 2013-11-22
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Last Modified: 2013-11-28
I am having some trouble with emails being accepted via Google, Hotmail, Yahoo, etc. In message headers originating from my server I believe this is a problem:

Received: from mydomain.com (mydomain.com [127.0.0.1])

Through configuration changes I can get mydomain.com to be my actual domain but I have not been able to get the ip address to reflect my actual external IP address. I have tried edits to /etc/hosts, /etc/mail/sendmail.mc, and /etc/mail/submit.mc in numerous ways and combinations but with no progress. I am running make on the /etc/mail directory or using m4 on a file basis each time I edit an .mc file and restarting the sendmail service.

Help is appreciated.
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Question by:jaw0807
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Assisted Solution

by:xterm
xterm earned 250 total points
ID: 39670571
I don't believe that your internal IP is the problem - can you please paste in here one of the verbatim error messages that you get from Google or Hotmail?

I'm guessing in actuality, the SECOND (not the first) received from line with your external IP in the headers is probably the culprit and it might have a reputation issue.
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Assisted Solution

by:popowich
popowich earned 250 total points
ID: 39670957
Hello,

Email reputation and deliverability issues involve many checks.

What is your public IP address?

Is it on any blacklists?  (check mxtoolbox)

What is your sender score?

Does your public IP have a custom PTR record and matching A record?

What are some of the exact error messages being recorded in your logs?

Are you only sending email to people that want to receive it?

Have you checked your mail logs for signed of abuse, compromised accounts & web forms?
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Accepted Solution

by:
jaw0807 earned 0 total points
ID: 39672179
xterm and popowich thanks for the suggestions,

My external IP is not on any blacklists via mxtoolbox.

Sender score is 81.

I believe we have a PTR and matching A record and will double check on it.

No error messages in my logs as the emails go out just bounce back.

Yes, we only send around 200 emails a week. Mail logs show no signs of abuse.

On the plus side earlier tonight an email went through to a gmail account. So I need to do more testing to determine why some go through and others bounce back. Thinking now it is more of where the on the site the emails are originating i.e. a blog or web form.
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Author Closing Comment

by:jaw0807
ID: 39683157
Original question was regarding sendmail configuration but since I finally have a confirmed delivery I don't believe it is sendmail or a reputation issue but possibly a blog or form issue. Will post a new question with details when I can narrow down the problem.
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