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Firstly thanks for all the replys and help. After some late night testing on Friday it turns out that infact it is a Firewall issue. When the Firewall admin was away I punched a hole in our DMZ to see what would happen, and the mail started to flow. Today I get to beat on the Firewall admin...

Number of ways, fastest, right click 'My Computer' > properties and on the General tab you will see under System: the OS you are running and the current service pack number if any are installed. You can also look using the 'Computer Management' applet and view System Information

SMTP Re-install made no difference. Drat. Bertram, I read your post on this forum when looking for clues, so I'm at the point that I think I have to try a service pack. I'll install Win2SP3 tomorrow and an IIS rollup and see what that brings. I'll report back then. Thanks

There is no such thing as a 'dumb question'. Just one you've heard a few times. No, I've checked it a couple of times now and with our firewall admin, there are no restictions on outgoing mail from any of the machines. Thanks for the help. I'll post again after the re-install. Cheers

Thanks for the reply Killman again, I have tried all unassigned, website and machine specific IP addresses. No luck. I followed you instructions and made a test SMTP site using port 25. Tried changing a FQDN's, IP addresses and adding Smarthosts, but I get a nothing moving out of the Queue...

Sorry I didn't answer your question fully. Yes the "Change primary DNS suffix when domain membership changes" checkbox is checked.

Hi Killman, No there is nothing in the DNS suffix. The "Append primary and connection specific DNS suffixes", "Register the connection's addresses in DNS" and "Use this connection's DNS suffix in DNS registration" are the only items checked.

Hi All, Win2k box IIS5 SMTP Virutal server running (I wish) I've read tested and tried the helpful hints for fixing our webservers smtp virtual server from this and other sites. It stopped working a day or so ago for (apparently) no reason. Yes, messages are going to the Queue and staying...