Port 25 is blocked for SMPT email sending all (3) email accounts
Posted on 2008-01-29
I am using Outlook 2003. I have three POP/SMTP accounts set up and all have been working fine until last week. Now I can receive email from these accounts but I cannot send anything out from any of the three accounts. I have confirmed that the SMTP settings are correct.
Error message - Sending' reported error (0x800CCC0D) : 'Unable to find the e-mail server. Please verify the server information in your account properties.
My operating system is Windows XP Professional SP2 on this workstation.
When I test the telnet port I get the following message - Connecting To smpt.comcast.net...Could not open connection to the host, on port 25: Connect failed. However, I am able to connect using port 587. I attempted the same command using another XP SP2 in the same LAN and get the same results.
Also, I use MS Onecare and I believe that they did some upgrade last week. That may be where the problem is but I can't find it.
When I run the telnet command on the server I get the message - "Connecting to smpt.comcast.net...Could not open connection to the host, on port 25: Connect failed. However using port 587 works.
Is there something in the Small Business Server software blocking port 25?