Okay, my Outlook has been functioning fine, no problems until this morning. I haven't changed any configuration in the email accounts, or anything like that. I run Outlook 2010 in Windows 7 64bit.

Starting this morning, when I try to send an email TO ANYBODY, I get a bounceback message saying:

Quote:

The following recipient(s) cannot be reached: SoAndSo@Yahoo.com on 3/11/2011 5:26 PM Server error: '554 5.7.1 <SoAndSo@Yahoo.com>: Relay access denied'

I'm now in a situation where I cannot send ANY email, and I can't find anything online that might help me diagnose this problem. Any help is appreciated.