[SATLUG] Setting up email server

[Samuel Leon]

I have another question.  What is everyone using for client access?  
Pop3 or IMAP?  I am only familiar with pop3.  Are there any advantages 
to IMAP besides security?  Also is it necessary to have a DNS server 
along with the email server?  All the help pages that I am following 
seem to have a DNS setup section alongside the email server setup section...

Thanks,

Sam