Help! Outlook 503 Error Message Driving Me Crazy

[davidandrews]

HI There
I have a new PC and transferred a PST file onto the new PC
and now I can not send email
I can receive, but not send.

Error message:=-

"Your outgoing SMTP email server has reported an internal error. If you continue
to receive this error message contact service admin or ISP. the server responded
503 valid rcpt command must preceed data"

The email account is from my ISP (ie: SPA...@ISP.co.uk)
and the SMTP settings are mail.plus.net

My ISP's email help page is here:-

http://www.plus.net/support/email/outlook_guide.shtml

and i have followed this to the letter

I have emailed the ISP and they blame the software

Who is right?

Please help

Thanks

[Rebecca]

I solved it (was googling about it when I came across this suggestion) Try
turning on authentication. Tools >> Email Accounts >> (Go into your account
and choose) More Settings >> Outgoing Server and turn on outgoing
authentication set to your normal details. It worked for me so I help it
works for you. :-)