Hi Bill,
Just to let you know - I have fixed the Mail Queues problem so we can rule out SOAP as a fundamental issue (I needed to regen the ssh keys for the zimbra ssh user).
I can open in a browser
https://mail.mydomain.com (I have the Zimbra Web client running fine, and I can try and open the AUTH URL but I get a message that HTTP GET METHOD is not allowed from Apache/Tomcat which makes sense. I can also connect via telnet mail.mydomain.com 443.
I'm really comfortable that this piece is working...and obviously my account login/pass works.
I think the problem is with SASL it's either not able to get the account information from the Zimbra Store or it's not able to negotiate a valid authentication method. I used to roll-my-own mailserver before Zimbra using Cyrus SASL, Postfix, Amavis, MySQL etc (one of the reasons I liked the Zimbra architecture so much) but now its' understanding how to debug these things inside of the Zimbra configuration and logging.
Mark