Diana,
Setting up your email server is detailed on the internet at several sites. An easy to read site is:
http://q87.com/faq.shtml#cat1_0
If this does not provide enough description, try the FREE windows advice sites provided by Microsoft.com and search for an answer by quoting the error message number "550".
All the best - ob1knowb.
Owen B Geary, October 2007
