Present mail setup for 2 accounts - want to separate everything

Question

Presently have 2 accounts in mail that is accessed by 1 icon on the dock. What I need is 2 separate mail programs on the dock that opens only 1 of the 2 accounts. In other words, 1 program per account. How do I do it?

Answer 1

When either of the 2 users logged in, they'd only be using one program/email client, in this case Mail, to access their emails. I thought that I could follow the same idea without setting up 2 users, or alternatively, as you are saying, 2 clients
The reason why this doesn't work is that when Mail.app (or any app, for that matter) starts up it looks for a specific configuration file to use. In Mail.app's case it looks for the file com.apple.mail.plist in the current user's preferences directory.
So if you could launch two copies of Mail.app at the same time they would both look at the exact same configuration file and have the same set of accounts, etc.
The reason why a different user gets different settings is that they have a different preferences directory from you - your preference folder might be /Users/kaal/Library/Preferences/ while some other user might be /Users/someoneelse/Library/Preferences/
There's no way to tell Mail.app to use someone else's preferences directory while you are logged in (that would violate the system security, for one thing).