Outlook is not sending Mail

[Ananda]

Hi,
Till yesterday everything was fine. Today outlook is not sending mail
instead it pops up for username and passward again and again. Password is
correct. I can log in directly to our POP3 mail server but Outlook is not
accepting that.
I disabled antivirus. I reinstalled Office 2003. I reconfigured my account
but no use.
Once I received a mail today which said "553 Sorry, that domain isn't in my
list of allowed rcpthosts."

Can someone tell me what went wrong.

 

[VanguardLH]

in

Till yesterday everything was fine. Today outlook is not sending mail
instead it pops up for username and passward again and again. Password is
correct. I can log in directly to our POP3 mail server but Outlook is not
accepting that.

Go to Microsoft's support knowledgebase (http://support.microsoft.com).
Advanced search.
Select "Outlook 2003" as the product (not Office since your problem is
with e-mail).
Search on "remember password protected storage". (I'm guessing you are
use a pre-Vista version of Windows but you never mentioned WHICH version
of Windows that you use!).
Read the instructions on how to edit the registry to delete the PSS keys
that cache the login credentials.

Once I received a mail today which said "553 Sorry, that domain isn't in my
list of allowed rcpthosts."

In the e-mail account defined within Outlook, configure it to
authenticate to the SMTP (outgoing) mail host.