[K12OSN] E-mail puzzle

[Bert Rolston]

Hi folks,

So I have send mail sending
fetchmail fetching
and squirrel mail squirreling

Here's my dilemma.

Sendmail sends the mail OK.

Fetchmail can collect domain mail from the ISP as the "mailman" user.
"mailman" is also a user on the local server.

HOW do I get individual mail from the mailman account using Squirrel
mail EG. user1 mail into user1 Squirrel mail mailbox from the "mailman"
account, user2,3...x and so on?

OR

Is there another way (without changing software) to do this?

Cheers,
Bert