I am planning a qmail/pop3/vmailmgr/courier-imap/squirrelmail installation 
(with almost no user logins allowed on this host) and would appreciate 
guidance on one particular point at this time:

In Life with Qmail, the following setup script is recommended:
=====
4. Create a /var/qmail/supervise/qmail-pop3d/run script containing:

#!/bin/sh
exec /usr/local/bin/softlimit -m 2000000 \
/usr/local/bin/tcpserver -v -R -H -l 0 0 110 /var/qmail/bin/qmail-popup \
  FQDN /bin/checkpassword /var/qmail/bin/qmail-pop3d Maildir 2>&1

where FQDN is the fully qualified domain name of the POP server you're
setting up, e.g., pop.example.net.
=====

FQDN is very clear if the Unix host is serving a single domain. However, 
what is recommended if the host is serving multiple virtual domains? I 
understand that this setup script is going to monitor port 110, but how will 
it know how to distribute from port 110 to the various virtual domains?

I've been going through the www.vmailmgr.org documentation, but am 
thoroughly confused.

Am I correct in thinking that the same user is going to be able to 
dynamically choose whether to download the email or leave the email on the 
server, depending on whether they use an MUA that downloads (for example, 
Microsoft Outlook) or whether they use a webmail MUA (for example, 
squirrelmail); and they can simply choose to use one MUA one day and the 
other MUA a few minutes later in mix and match style?

Thanks in advance

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