Hi
There are normally only 3 pieces of information needed to send email
1. The name of the smtp server ' mymailserver '
2. A Port number normally '25'
3 And of course the address 'myemail@stuffthis.net'
1 & 2 you can check by looking into the options of Eudora, Outlook, OE etc where you should be using the same settings.
Possibly your email handler has blocked Port 25, to stop relayers etc and you might need to use Port 465 plus a password and a security protocol.
or
Yes your exchange server may have detected a new mail sender program, and blocked it, But this isn't very common, as lots of programs are now equipped to send email, and blocking them would cause lots of complaints.
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