I've been using .net mail for sometime now and needed to send a lot more emails so I subscribed to AtomPark Mass Emailer software. They gave me a smtp server address, a username and password and I was ablel to setup in Outlook and it worked fine. However in my vb.net program that I've been running for awhile when I try to send email through the AtomPark server, it fails authentication. Again it works in outlook so I know I have the correct settings. Anyone see anything like this where .net mail just not connecting to a 3rd party smtp server.