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Summary
Pull mail servers are frequently installed on
an organization's main SMTP server in order to allow users to read their mail
from client computers located within the organization, or potentially anywhere
else on the Internet. Using a pull mail protocol obviates the need for users to
log in using Telnet, SSH, or some other remote-access protocol, and allows
users to use mail readers in their OS of choice. Two pull mail protocols are in
common use today: POP-3 and IMAP-4. Of the two, IMAP is more powerful, as it
allows retention and organization of mail on the server; but this very fact may
increase demands for disk space and network bandwidth on the server, so you may
prefer to use POP.The Fetchmail program can be used as a bridge
between a mail server to which you have access through a pull mail protocol and
other mail systems, such as a mail server on a LAN. You can use Fetchmail to
retrieve external mail and inject it into a local mail queue, simplifying
users' mail experiences.
