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SMTP HELO Record When Relaying

Posted on 2011-03-21
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Last Modified: 2012-05-11
I have a quick question. I am using SMTP2GO to send emails from my in-office server (my server sends automatic emails from my accounting software by connecting to this 3rd party SMTP).

I just figured out I was havign a mail delivery issue that I believe is caused by the server identifying itself as 127.0.0.1 in the HELO portion of the header.

As you can see in the server log below:
2011-03-19 03:35:05 1Q0mwS-0001q6-Sb <= me@mysite.com H=79-151-113-112-philadelphia.hfc.comcastbusiness.net ([127.0.0.1]) [79.151.113.112] P=esmtpa

I send from a separate IP, say 1.2.3.4.5 which is different from my site, mysite.com located at IP 6.7.8.9.10 .

Should I use my FQDN mysite.com OR the local server's ip? I am sending from me@mysite.com but it's not from the site's IP (it is listed in the site's SPF records, however).

Thanks!
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Question by:Candidochris
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DonConsolio earned 2000 total points
ID: 35186473
Best practice is to use your FQDN and make sure it correctly resolves and
the reverse lookup also correctly resolves to the same name.

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Author Comment

by:Candidochris
ID: 35189780
Don,

Thanks for the response.
I am not 100% sure I follow.

If I am sending from my ISP's static IP address, which resolves to comcast via reverse DNS.

If I use my FQDN, it will not resolve to the same place -- it would resolves to my web server. Unless you mean that I should use my FQDN even behind my static IP and just make sure it resolves properly? I just want to make sure, as technically, I am not sending from this address.

Thanks!

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