Exchange Server 2007 Not Receiving Mail

I have an Exchange Server 2007 that has suddenly stopped receiving mail, been working fine for 2 years now.  The mail is queued up at the external webmail sites waiting to flow down.  Sending out appears to be fine.  Please advise on troubleshooting steps.  Thanks in Advance
btmtechAsked:
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
Your mx record is not pointing to mail.domain.com, it points to domain.com which is answered by an EXIM box, not Exchange, so I would check your DNS / MX records by the sounds of it.

Alan
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Alan HardistyCo-OwnerCommented:
You may be suffering from Backpressure and I have a quick fix for that in my article:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_4259-Exchange-2007-2010-Backpressure-Quick-Fix.html

Essentially, you are probably low in disk space, so you need to do a tidy up.

Alan
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btmtechAuthor Commented:
I have 26.1GB of free space on C:
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AmitIT ArchitectCommented:
Any change made recently, check with your ISP.
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Alan HardistyCo-OwnerCommented:
It's not the amount, it's the percentage of free space that's important, that or memory in use.

Is port 25 open happily (you can test on www.canyouseeme.org using port 25)?

Did your MX records change?

Did your domain name need renewing and no-one renewed it?
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btmtechAuthor Commented:
Port 25 and 587 are happy

Not sure on MX records, can I test somehow?

I have a certificate for the smtp server but I do not necessarily see one for the domain
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Alan HardistyCo-OwnerCommented:
Yes - check on http://mxtoolbox.com

Did you try my quick fix to see if that resolves the problem?

Alan
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AmitIT ArchitectCommented:
Might cert is expired.
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Alan HardistyCo-OwnerCommented:
An expired certificate isn't going to stop you receiving mail.
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btmtechAuthor Commented:
mx records point to our external email server
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btmtechAuthor Commented:
I did try the quick fix
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btmtechAuthor Commented:
Could it be DNS at all?
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Alan HardistyCo-OwnerCommented:
It could be DNS.  Has anything changed lately?

Can you telnet to your server remotely on port 25?
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btmtechAuthor Commented:
telnet works on 25

nothing on dns that I know of, what is needed for exchange?
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Alan HardistyCo-OwnerCommented:
DNS only needs to resolve your IP address of your MX record.

Do you want to divulge your domain name, which I can hide, so I can see if I can spot anything amiss?

Alan
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btmtechAuthor Commented:
hmicmn.com
mail.hmicmn.com
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btmtechAuthor Commented:
can you tell me exactly how you are verifying that? are you using mxtoolbox? what are you inputting to see those results?
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Alan HardistyCo-OwnerCommented:
I use www.dnsstuff.com which tells me what I told you. I have a subscription, but don't think you need one for the domain report.
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btmtechAuthor Commented:
so is that an issue in the dns records on the server or with the hosting company that sets that mx records?
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Alan HardistyCo-OwnerCommented:
The hosting company that manages your external DNS records.
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Alan HardistyCo-OwnerCommented:
Your DNS records seem to be managed by gemwebsolutions so it should be them you contact.

Alan
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