Outgoing mail is no longer working (error 0x8004210B)


I get the error :

Task ‘xxxx@xxxxxxxxxxxxxx.com – Sending’ reported error (0x8004210B): ‘the
operation timed out waiting for a response from the sending (SMTP) server.
If you continue to receive this message, contact your server administrator or
Internet service provider (ISP).’

when trying to send mail. How can I fix this?


Your local ISP may have begun blocking port 25. Many ISP’s do this to attempt to make you only send through their SMTP servers so they can better manage all mail leaving their network (to control spam). Change the port to 2525 in your email program and it will likely work. If 2525 does not work, try port 587.

Another – less likely cause – is hung anti-virus software running on your computer. Some anti-virus / anti-malware software re-directs all port 25 activity to scan mail before it leaves your computer. Try to restart your computer and/or anti-virus software and see if this corrects the problem.

Leave a Reply

Your email address will not be published. Required fields are marked *