SMTP HELO Record When Relaying

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 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 <= ([]) [] P=esmtpa

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

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

Who is Participating?
DonConsolioConnect With a Mentor Commented:
Best practice is to use your FQDN and make sure it correctly resolves and
the reverse lookup also correctly resolves to the same name.

CandidochrisAuthor Commented:

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.


Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.