Relaying mail not allowed

[Mary]

I am not sure if this question should be posted here, so
forgive me if this is not the right place.

I keep getting a message back every time I send out e-
mails from my account. (This just started. Everything
had been working fine for a long time.)

The message says - FROM: System Administrator - The
following recipient(s) could not be reached:
NAME OF E-MAILED PERSON | DATE | TIME
550 relaying mail to NAME OF E-MAILED PERSON is not
allowed.

I am puzzled. If anyone can help, I would surely
appreciate it.

Mary

 

[Lanwench [MVP - Exchange]]

Contact your ISP - you probably need to authenticate to their SMTP server
for outbound mail.

 

[Steve]

This could also be from a corrupt account. delete the
outlook account (not outlook itself) and put the account
back in. If you are not sure how to do this properly, call
your ISP and they can walk you through the steps. Make
sure you have your email username and password before you
call them.