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problem connecting to SMTP

Posted on 2010-08-28
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Last Modified: 2013-11-05
I have a WIN 2003 server.  I have a SMTP server on it and now I want to connect to that mailserver from home to send a mail.  I have allowed relaying from my home IP, etc. but I can't get it to work.

Incoming mail work fine (using the built-in POP3 service on the server) but when trying to send with Outlook express I get socket error 1051 error 0x800CCC0E

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Question by:usbboy
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by:woolnoir
ID: 33549701
Do you have a firewall either on the 2003 server, or between it and the internet connection. The fact you get a socket error on SMTP and non POP3 suggests some level of filtering is happening...
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by:usbboy
ID: 33549750
I tried it now from another location and it worked,  so the problem seems to be in my home setup.  Let me dig into that before closing this thread but thanks so far for pointing me in the right direction.
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by:woolnoir
ID: 33549758
The maybe your blocking the port on your home firewall - or maybe your ISP is filtering it (some do, to force you to use their ISP mail server and reduce spam) COuld be worth checking both.
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by:woolnoir
ID: 33549766
You might want to try telnetting to another SMTP server on port 25

10      cluster1.eu.messagelabs.com      193.109.254.67      5 min      SMTP Test      Blacklist Check

a telnet to cluster1.eu.messagelabs.com:25 followed by a HELO test.com should elicit a response, if you get a time-out then its youre home network or isp filtering.
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by:usbboy
ID: 33549846
You are right.  It is my ISP filtering  port 25.    telnet cluster1.eu.messagelabs.com timed out and then I tried another mailhost that uses port 587 and that connected fine in telnet.  So now the question is how I setup my SMTP to listen to port 587  ?      
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woolnoir earned 250 total points
ID: 33549852
Open Start > Programs > Microsoft Exchange > System Manager.

Expand Administrative Groups > First Administrative Group > Servers > SMTP Backend name here > Protocols > SMTP.

Right click "Properties" on "Default SMTP Virtual Server". In "General" tab in "IP address" section press "Advanced" button. In "Advanced" window press "Add" button. Leave "(All Unassigned)" in "IP address" field and enter alternative port (for example 2525) to "TCP port" field. Press "OK" three times.
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by:usbboy
ID: 33550292
Works fine now.  Thanks.
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