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"Smtp server cannot be found"

Posted on 2006-05-08
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Last Modified: 2010-03-18
'smtp server cannot be found' is the error I get when installing Outlook on my network. I can receive mail however. This is a small network of about 30 users. There are 3 stand-alone servers with one of them acting as dhcp and dns server for the network. The users are in one of 3 different workgroups. There are users in one workgroup who have Outlook running fine, but another group (mine) that gets the error message in question "smtp server cannot be found". I know the setup information in Outlook is correct cause I've used the same setup in a lot of other locations. I can ping my mail server ( eg. ping smtp.myservername.com) and the ping is successful and resolves the name to the ip address.
We do have a Sonicwall on the default gateway which is set to allow smtp traffiic to pass. But anyway, other users are successfully using Outlook on the network so it doesn't seem to be a router/port issue. Also I had a local smtp server set up on  the network that I was using  to send notifications of successful (or not) job completions using Veritas Backup Exec backup program. That was working fine for a while and then suddenly stopped. This prompted me to install Outlook because you can use a  mapi client with the Veritas progam as well. But then I get the error, which again is saying that Outlook can't find my smtp server (smtp.myservername.com ). Any help or suggestions would be appreciated.
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Question by:Kaopectate
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jasonwilliams74 earned 2000 total points
ID: 16632832
I remember I had something similar to this.Here is what I did to resolve it.

1. Double check the spelling of what you have specified in the SMTP field. If it is correct, try putting in the IP address specifically and seeing if that works.

Also, see if you can, from one of the troublesome computers, telnet to the SMTP server on port 25 and issue some basic commands to ensure you can get outbound access.

2. I remember I had some additional security settings that were setup somehow, that included SMTP on a alternate port. Make sure it is defaulting to port 25.

3. Make sure that if you are not using any SSL or TSL, that is not configured in the client.

Let us know how it goes.
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by:Kaopectate
ID: 16644177
i didn't have any luck with any of the above. thanks.
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by:jasonwilliams74
ID: 16644186
does it work if you put the IP specifically in the SMTP field?

This is just s simple SMTP server, correct?
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by:Kaopectate
ID: 16652303
still the same when you supply the internet address. the smtp server in question has been setup in outlook on a dozen computers on a dozen different networks and it works without problems. But on our home network ( and actually on one other network) we keep getting 'smtp server not found'. there seems to be some sort of glich with our network. also the firewall seems to be set properly, although i'm going to continue to look into that.
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by:jasonwilliams74
ID: 16652668
It should work with the IP address. I wanted to see if it was a DNS issue. The fact that the IP address isn't working either makes me wonder if the computers in question are networked properly? Can they access the internet? Maybe try re-setting up Outlook?
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by:Kaopectate
ID: 16705074
This problem was finally resolved. What happened was that at work the network was switched from dsl to cable (Optimum Online). But we had no reason to suspect the cable as the cause. But I began to think though that the cable was the only thing it could be. After a few calls and finally getting the right technician the situation was fixed. It turned out that a filter was automatically being enforced based on the amount of e-mails we were sending. Because cable is a shared network they have limits on the amount of e-mails per hour sent and also the size. The problem was they had us configured as if we were home users instead of a business. thanks for the help and i rewarded some points for the good advice. hope it's okay.
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