I've problems with Eudora, trying to send a message using an account which has SMTP flag disabled (just testing the feature).
Eudora hangs (indipendently of tls usage), and the qmail-smtpd process hangs the same. When I stop Eudora sending, also qmail-smtpd stops.
When I try to recreate the same problem with Outlook, Outlook simply ask me again the password for the outgoing account.
It looks like qmail-smtpd is looking for a new username/password input, while Eudora is waiting for something from the server side.
May someone (Bill!) look deeper into the code?