SMTP - no mail being sent

[rhyno2k]

Hi,


I've been grappling with the problem of not being able to send mail outside our corporate domain, but NOW I get notified (by the boss!) that our ASP mail form is not sending mail INTERNALLY either! Arrrgh...

No ASP error is generated -- the redirect page shows up to the user, and it looks like everything is kosher. Every test email I've sent from the form shows up as a .EML file in the \mailroot\drop directory. It never reaches the intended mailbox.

However, I get notified from the server: "Delivery Status Notification (Failure)", with the message attached... Why am I able to get the error message? Both mine and the target email address are on the same domain!!

The only thing I see in the SMTP logs is "500 Syntax Error". Nothing in the event logs...

Suggestions? This form is our lifeblood in getting info from potential leads!


Thanks,
--RHYNO

 

[epohl]

RHYNO,

Let me make sure I understand first. Sounds like you are using IIS (SMTP) on a Windows 2000 server to send mail external and also internal (I assume your are sending it to your internal mail server). If this is the case you might want to setup this server to relay all its mail to your mailserver as a smart host. This article you prove helpful and also has some tips to test your smtp setup.

http://www.microsoft.com/technet/tr...tsolutions/ecommerce/deploy/depopt/d5smtp.asp

 

[rhyno2k]

Hi epohl,


Thx for the article, it was indeed helpful. Tried different methods of delivery (Dropping text file onto \drop folder, etc.), and all end up with same result...

Every internal message is delivered instantly, outgoing stays in \queue for a day, then dumped into \badmail forever.

I tried adding our ISPs mail server to the Smart Host, but that didn't affect anything...

I'm aware of some DNS issues on this machine (lots of IPNATHLP - 31011s) - I'm thinking this could be a cause of this problem. Have a "working knowledge" of DNS, but to me, it looks like there's a mail.ourdomain.com entry in there, and forwarders are setup to our ISPs DNS servers... anything else to try here?

You're right - I'm using Win2k SP2 Server w/IIS 5. Also using a 3rd party mail server on same machine - which is functioning well (can send "regular" email in & out).


Perplexed,
--RHYNO
___
Let me make sure I understand first. Sounds like you are using IIS (SMTP) on a Windows 2000 server to send mail external and also internal (I assume your are sending it to your internal mail server). If this is the case you might want to setup this server to relay all its mail to your mailserver as a smart host. This article you prove helpful and also has some tips to test your smtp setup.

 

[epohl]

If internal works fine and external does not sounds like it could definitely be a DNS problem or possibly a firewall problem. I would try to ping one of the external domain names from this server and see if the name is resoved and if you receive a reply. Perhaps there is also a way you could setup the third party mail server software as the smart host.