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email to specific domain is stuck in mail queue

Hey guys,

Ive been noticing over the past couple of day and today most heavily that it seems mai being sent from my domain to some other domains (specifically yahoo) is hanging in the queue forever! I Meanwhile if I send it too gmail it flies right through. I cant figure out for the life of me what is casuing it either. Any suggestions? I went on zonedit.com and looked up my Reverse DNS and I dont think there is anything wrong there but Im sort of a newbie to all of this so Im not too sure... any suggestions please???
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sbodnar
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sbodnar
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1 Solution
 
tigermattCommented:

The most likely issue is that you have a DNS misconfiguration somewhere, that you are running on a dynamic IP, or that you have been blacklisted.

Check all your DNS setup as per http://www.amset.info/exchange/dnsconfig.asp.

If you cannot resolve it, I would suggest you switch to sending mail out using a Smart Host and be done with it. Relaying mail through a Smart Host (such as the ISP's SMTP server) is the way I always configure Exchange to send emails out to the Internet as I find it much more reliable: http://www.amset.info/exchange/smtp-connector.asp

-Matt
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sbodnarAuthor Commented:
whats a smart host?
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tigermattCommented:

A Smart Host is essentially another SMTP server. In this case I was referring to using the SMTP Server at your ISP as a smart host, so that Exchange sends all outbound email through the ISP's mail server. It's possibly the easiest way around these sort of issues, and always works for me.

-Matt
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sbodnarAuthor Commented:
How do I find out my ISP's mail server??

Right now web.com is hosting my domain name.
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tigermattCommented:

That is something you'd have to find out from the ISP. Give the ISP a call and see what you can find.

N.B. I'd use the ISP as in the company providing your Internet connection, rather than the domain host. They are more likely to have an SMTP server which you can use.

-Matt
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sbodnarAuthor Commented:
how do I know if I have a DNS misconfiguration? reason im asking is because this worked fine a week ago or so and all of a sudden now it seems to be hanging
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tigermattCommented:

If it was working a week ago but is not working now, something must have changed. Email flow doesn't just stop working in this fashion.

Work through http://www.amset.info/exchange/dnsconfig.asp to verify your DNS is correctly configured. I'd also run your server's public IP through something like the MX Toolbox Blacklist checker to verify it is not on some sort of blacklist.

-Matt
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sbodnarAuthor Commented:
I notice something different in the SMTP banner section. My banner reads mydomain.com meanwhile in my reverse dns, (mx), and (a) records point to server1.mydomain.com. Does this matter? Should I change it? Will it screw anything up if I do change it??
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tigermattCommented:

There's a chance that could be an issue. Many hosts will check your SMTP banner matches up with the other records. You can't screw much up by changing it to server1.mydomain.com. If that is what your MX and PTR records resolve to, then that would be the correct SMTP banner configuration to use.

-Matt
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