I need to setup IMail on a machine named pa-is-01.
 
The system will support 35 domains with approx 50 users per domain.

ok

 When the uses setup their email I would like to allow them to use mail.'their domain name'.com as the incoming mail (POP3)

that's do-able. For theirdomain.com zone file:

mail.theirdomain.com          A   ip.ad.re.ss

and outgoing mail (SMTP) mail server information.
 
Is there any way to do this

see above.  Also, for web msging, if you don't have another web server on that machine, set Imail web msg port to 80 and the user can do this:

http://mail.theirdomain.com


 or do I have to rename the host from pa-is-01 to mail

no

and use mail.'single domain name'.com for all users of all domains?

You can, I recommend, do that, to simply your zone files, make a common include file:

;file: db.common
;namservers
@           NS  ns1.david.com
@           NS  ns2.david.com
;mailexchangers
@           MX  10  pa-is-01.com
mail        MX  10  pa-is-01.com

Then in BIND8, you can build your zone files

@   SOA  blah blah
$INCLUDE db.common

Len

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