Question : Problem: Exchange 2003 - won't send to some e-mail address

Hi,
I have a small issue where i can not send E-mail to all @hotmail.co.uk &.com, ymail and aol so far as i know.

If i go to the queue in ESM it and click on Hotmail it says An SMTP protocol error occurred.
ymail says: The connection was dropped due to an SMTP protocol event sink.

i have checked on the internet to see if my IP address has been blacklisted which it hasn't.
I am able to send e-mails internally & to O2.co.uk & intradreamz.co.uk & to some others

Has anyone got any ideas?
Many Thanks

Wayne

Answer : Problem: Exchange 2003 - won't send to some e-mail address

any idea?