smtp question

We are not able to send emails to gmail from an internal application server.  Other external emails do accept the messages.  Does anyone know what may stop this ?  I have tested blacklisting and it doesnt show it is.
Eric DonaldsonAsked:
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Dr. KlahnConnect With a Mentor Principal Software EngineerCommented:

Log in to the application server so that you're on the machine with the purported problem.

Open a command window

Do an MX lookup on gmail to see what their receiving FQDNs are

telnet <gmail FQDN> 25

See what gmail responds with.  There should be an identifier followed by one or more lines terminating in a line with only "220".

Let us know what you discover.
Mal OsborneAlpha GeekCommented:
SPF set up OK?

An SPF mismatch will certainly cause significant problems with email being blocked as spam.  no SPF will have a smaller effect. Mismatched DKIM will also cause issues, but having no DKIM set up won't make much difference.

There are a number of services that can test emails for potential "spaminess", it would be a good idea to send to one of these from within your app, and see what it reports back.

Go to follow the simple instructions, and see what gets reported back.
Eric DonaldsonAuthor Commented:
Yes, gmail did respond with 220
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