Error '80040211' When Sending Email in ASP

All this while, the web server used to host a web application that sends out email when a request is submitted suddenly couldn't send email anymore.
Error returned was this weird figure: Error '80040211'.

Seek my best buddy help: Google and found this link:
http://forums.aspfree.com/asp-development-5/error-80040211t-96396.html

Based on the forum, what that guy did is basically change the 'sendusing' fields from 2 to 1.
I tried and the trick works. ^_^

And from the explanation from MSDN
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cdosys/html/bb2a4e60-080f-49bf-be71-e2a7e52ce5ad.asp

cdoSendUsingPickup (value 1)
Send message using the local SMTP service pickup directory.

cdoSendUsingPort (value 2)
Send the message using the network (SMTP over the network).

Couldn't convince myself why this happens since my web server is over the network, but it works. Let's put this on for now, while I'm busying with another project at the moment.