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You could just try removing the gateway from the internal nic card. That way it always gose to the public nic card for internet. This is the way I have my gateway server setup. I was havin the same issue untill I removed the gateway from the internal card

So far no luck. I did get some more info. Come to find out that the mail server is not accepting domain litterals. Here is the error below. Not sure why WARN: One or more of your mailservers does not accept mail in the domain literal format (user@[0.0.0.0]). Mailservers are technically...

I havent tried reinstalling SMTP from SP3 that I am aware of. I can send mail to them if I connect via telnet. The mail is accepted and deliverd.

You might try to run the esutil on the database for defrag and to cleen up any old deleted records. This happend to me once but after I rescanned the data base it has been like gold.

I cannot seem to resolve this problem There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <mail.xxx.xxxxxx.xxx #5.5.0 smtp;550 Address &quot;comptek4@xxx.xxxxxx.xxx&quot; assumed to be invalid - Impossible to verify>

Go to the web site DNSSTUFF.com do a reverse lookup on your server. If the destination is resolved but no A recored is found the servers using reverse DNS verification on the address will not accept your mail. I am going throught this right now. My ins. company can send to me but i cant send to...

You should try the GFI products. They have every thing for exchange you could ask for. Http://www.gfi.com

You should try doing a NSLOOKUP on the on the domain or a tracert on the IP address. If the trace fails send the error report to the service it failed on. I could not send mail to the address below this it what I sent them and it was fixed. (I.E. Below) Tracing route to ville.k12.nj.us over a...