T5 wrote:

I have my POP and SMTP settings correct (I have run test message and
it sends and receives) yet when OL automatically sends and receives,
I get the above error with server responded on 553 unknown address.

I have increased server timeout but still nothing, any help is
appreciated

http://support.microsoft.com/search/default.aspx?catalog=LCID%3D1033&spid=928&query=0x 800CCC0F+&adv=&ast=1%2C2%2C3%2C4%2C7&mode=a&cat=Fa lse&kt=ALL&title=false&mdt=&pwt=False&res=20&1033c omm=1
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Brian Tillman