I can post a brief explanation here, but this assumes a good, solid, working knowledge of the following items:
We run a single IP address
ALL HOSTED DOMAINS MUST BE CONFIGURED TO USE THE SAME IP ADDRESS IN SMARTERMAIL
DISABLE the ENABLE PRIMARY IP ON FAILURE setting in SMTP OUT.
The PORTS are configured per the diagram and settings referenced here:
The public FQDN (fully qualified domain name) of our SSL SmarterMail connection is "securemail.chicagonettech.com"
This handles all of the web access.
For the client (Outlook, Thunderbird, SmartPhone, Tablet, laptop, etc) access, all calls, POP, IMAP, and SMTP are made to securemail.chicagonettech.com - no matter what the client's domain name is.
The client the uses his or her e-mail address and password as their login information, just like they do when accessing via a web interface.
Phonr: (773) 491-9019
Phone: (224) 444-0169
E-Mail and DNS Security Specialist
Network Security Specialist
Customer Service Portal: https://portal.chicagonettech.com
Security Blog: http://networkbastion.blogspot.com/
Web and E-Mail Hosting, E-Mail Security and Consulting