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SMTP Mailing Issue

post #1 of 5
Thread Starter 
Hello OCN!

I have been fighting this issue for a little while now, and hoping to get some help. I feel it's just a matter of me not understanding fully how SMTP works.

We have a Windows Server 2003 running SMTP Service. Unfortunately, all of the outgoing mail gets stuck in the Mailroot\\Queue folder. The SMTP is used by intranet apps to send email to bank employees. All of those emails eventually end up in badmail. We only send mail.


Example of the mail:
From: intranet@machine.domain
To: BAKADIN@live.com

We are sending mail to outside domains.

We can Telnet to the server without issue, and use it to send mail. This mail is then placed in the queue folder (where it sits.)

We have tried removing SMTP and POP3, and reinstalling it.

Notes:
- This service has worked for 3 years flawlessly until April 1st~
- The only thing that has changed is our DNS / network IPs. (And in a way, ISP)
- Port 25 is open on the server.
- Relay includes the SMTP server's IP address.
- Authentication is set to Anonymous
- Outbound security is set to anonymous
- FQDN is set to SMTP "server.domain"
- We can send mail inside the domain without an issue.

Example: intranet@machine.domain can send mail to thatguy@machine.domain

Is it possible our new ISP is not allowing port 25? Am I just missing something?

I apologize if this is not in the correct forum!

Thanks for any help.
post #2 of 5
Sounds like your ISP is blocking SMTP.

The fact that you can send between addresses makes it sound like it's working correctly.
    
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post #3 of 5
Thread Starter 
Thank you for your reply. I read it shortly after you had made it but wanted to test some things before responding.

I haven't really had time to test, though. It seems I can not telnet to any outside domains. When I go home tonight, I'm going to attempt to telnet to the outside world.

Are there any mail servers that I can test telnet on port 25 with?

I figured SMTP.GMAIL.COM may work. I also noticed in a Microsoft technet article they had MAIL.COSTOSO.COM as an example.

Any help with a "test subject" would be awesome.

Thanks again.

Edit:

I really just need a way of being able to successfully Telnet to port 25 outside my network.
Edited by Bakadin - 4/20/11 at 11:03am
post #4 of 5
Thread Starter 
ISP was blocking port 25.

Thank you for your help!
post #5 of 5
Just a side note that the majority of ISPs block 25 in order to reduce spam volume.
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