SBS not sending mail
Hello,
I have an aged SBS2003 box which is now, not sending e-mail. Receive yes, send no. SMTP seems to be working as I can telnet to it and get a response. The server has mail sent to, and sent from, directly, no connectors. I can look-up remote server MX records with NSLookup and I can browse the web without issues. According to MXTools.com, the server is not on any blacklist.
It just stopped working. I am not sure why.
I have; rebooted the server, restarted all of the services, modified the registry to allow for Exchange databases >18GB in size (current db size is 18.1GB), tried a new forwarding DNS server.
Any ideas.
I have an aged SBS2003 box which is now, not sending e-mail. Receive yes, send no. SMTP seems to be working as I can telnet to it and get a response. The server has mail sent to, and sent from, directly, no connectors. I can look-up remote server MX records with NSLookup and I can browse the web without issues. According to MXTools.com, the server is not on any blacklist.
It just stopped working. I am not sure why.
I have; rebooted the server, restarted all of the services, modified the registry to allow for Exchange databases >18GB in size (current db size is 18.1GB), tried a new forwarding DNS server.
Any ideas.
ASKER CERTIFIED SOLUTION
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Using a smart host sometimes offers better support, using your own server can sometimes cause messages to be held up by remote spam filters from time to time ( in my experience ). As mentioend maybe your ISP has applied a new smtp filter that requires you to use them or require authentication etc. I would check with them.
Also you should be able to telnet port 25 out of your network somehow as a test to make sure that your firewall admin guy has not just closed the port down by accident.
Also you should be able to telnet port 25 out of your network somehow as a test to make sure that your firewall admin guy has not just closed the port down by accident.
ASKER
Attached is a screen-shot of what mxtools reports. I can telnet to the host, suggested above, from another machine just fine.
Screen-shot-2011-05-10-at-8.45.4.png
Screen-shot-2011-05-10-at-8.45.4.png
Check with your ISP if they block port 25 on your IP address. it happens.
ASKER
Firewall was it. Thanks!
ASKER
Why would using a smarthost be necessary now. It has worked this way for the last three years? The queue shows absolutely nothing of value, only the waiting messages.