Can't send email thru Outlook 2007

[Mai Hoai An]

Dear all,
I'm using Microsoft office Outlook 2007 with Win Vista. I can receive an
email with many accounts but can't send an email from any of them. When I
test account setting, Logging onto incoming mail server POP3 is completed but
sending test email message is failed. The error is "the server responded: No
550 RDNS entry for 115". Before, I could send an email but I can't now. Pls
help me!!!

 

[Brian Tillman [MVP - Outlook]]

I'm using Microsoft office Outlook 2007 with Win Vista. I can receive an
email with many accounts but can't send an email from any of them. When I
test account setting, Logging onto incoming mail server POP3 is completed
but
sending test email message is failed. The error is "the server responded: No
550 RDNS entry for 115". Before, I could send an email but I can't now. Pls
help me!!!

You're sending IP address does not have a reverse DNS entry and the receiving
mail router is rejecting the message because of it. This is something you
should be discussing with your mail service provider.

 

[Mai Hoai An]

I'm using AVG anti virus. I've used this one for long time, but the problem
just happened recently.