Error when sending email

[roccofat]

I cannot send emails, but I can receive. AOL is the server. I receive a 554
error message from System Administrator which reads: Your message did not
reach some or all of the intended recipients.

Subject: RE:
Sent: 6/16/2008 6:54 PM

The following recipient(s) cannot be reached:

'XXXXXXXXX' on 6/16/2008 6:54 PM
554 TRANSACTION FAILED

I have been using Outlook 2007 since it came out and have had no problems
sending emails. Thank you.

 

[Elizabeth]

I'm getting the same error message. I can receive just fine, but I can't send e-mail as of yesterday afternoon. I am not sending a large file, just a text test message, & I cannot send to AOL, Yahoo, or AT&T e-mail accounts (anyone):

****************
Your message did not reach some or all of the intended recipients.

Subject: Test
Sent: 6/19/2008 10:19 AM

The following recipient(s) cannot be reached:

'*******@attglobal.net' on 6/19/2008 10:19 AM
554 TRANSACTION FAILED
*****************

Help?!