Can Send but Cannot recieve mail after redirecting mxrecords SBS 2003 Exchange 2003

I canceled my subscription to my spam filter company for a client of mine.  I decided to just point the MX Records directly to the server (SBS2003).  After doing so they cannot receive mail.  I tested the mxrecords using mxtoolbox.com and it tests good.  They are receiving mail from their phone answering services based out in Texas, they can do internal email; however, when I send them a test email from my hotmail, gmail, and personal domain account he doesn't receive them.  I will get a bounce message after about 4 hours from my domain email account but no bouncebacks from my gmail or hotmail account.

I tested port 25 using yougetsignal.com on the external IP and it is open.

I see nothing in the Exchange Que.

Please Help.
Computer HelperWindows Server AdminAsked:
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
If the MX records have been changed and the port is open, then the mail should start to flow, unless the Exchange server has been configured to ONLY receive emails from the Spam Filtering company.

What settings are configured on the Default SMTP Virtual Server properties under the Access Tab> Connection Control?

Is it Only the list below with a few IP's or All except the list below.  Should be All except.....

Alan
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Computer HelperWindows Server AdminAuthor Commented:
It was set to "only".  It had a list of IP addresses.  I changed to to "All except"

I will test it to see if that fixes it.

Thanks
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Alan HardistyCo-OwnerCommented:
That should help :)
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Computer HelperWindows Server AdminAuthor Commented:
Thank you.  You Rock!!
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Computer HelperWindows Server AdminAuthor Commented:
They are coming in fine now.  I saw that and it looked funny but I was afraid to try it and wipe out those addresses.  It worked great!
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Alan HardistyCo-OwnerCommented:
You're welcome.  It's the usual answer when switching from a 3rd party spam filter provider as without setting those settings, others can still email direct to the server, so it is usually locked down to just the 3rd party.

Of course when you undo that by switching to direct mail, the restrictions need to be lifted otherwise it gets very quiet on the email front ;)

Make sure you implement some form of Anti-Spam and if you want to do that for little cost, please have a read of my article:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2527-How-to-prevent-Spoofed-Emails-in-Exchange-2003.html

Alan
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Computer HelperWindows Server AdminAuthor Commented:
The emails stopped coming in about an hour later.  Is there something else I need to do?  When I send him a test email nothing shows up again.

"Of course when you undo that by switching to direct mail, the restrictions need to be lifted otherwise it gets very quiet on the email front ;)"

What restrictions need to be lifted?
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Alan HardistyCo-OwnerCommented:
I was referring to the restrictions that are put in place when configuring a 3rd party to use for Spam Filtering.  The restrictions being the only allow the 3rd party to send emails to the server and no-one else.

Have you checked the MX records to make sure they haven't changed?

Is port 25 still open?  Check on www.canyouseeme.org

Do you want to email me a valid email address so I can test?  Might make the solution a bit quicker?  You don't have to, but I can usually see a lot more a lot quicker once I can test rather than speculate.

Alan
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Computer HelperWindows Server AdminAuthor Commented:
You are not going to believe this.  The connection reverted back to "Only the list below"  I had to switch it back. I will watch it to make sure it does change itself back.
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Alan HardistyCo-OwnerCommented:
Random!  Make sure you restart the SMTP Service after making the changes.
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Computer HelperWindows Server AdminAuthor Commented:
Done, Thanks again!
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Alan HardistyCo-OwnerCommented:
My pleasure.  Fingers crossed it stays set the way you want it!
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