Outlook Express Send and Receive Error: 0x800CCC0E

Posted by admin on May 21, 2010; This entry is filed under Uncategorized.

I came across a problem with Outlook Express today where the client could receive email, but could not send it. After looking up the error code on Microsofts Website, I found this KB Article highlighting a known issue with MSN which prevents any other outgoing mail service from being used while MSN is connected.

However, this did not solve the problem. To further investigate, I opened a telnet session to the smtp server in question, and found that the connection could not be made (although it connected successfully from an external machine).

It turned out that port 25 (Outgoing email port) had been blocked by the ISP, and to resolve the issue I had to use an alternate smtp port ( 587). This solved the problem! I think what had happened is after the machine was infected with a virus, the ISP blocked port 25 to prevent spam email from being sent out by the virus!!

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