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Viewing Mail Service Settings from the Command Line
To view Mail service conguration settings:
$ sudo serveradmin settings mail
To view a specic setting:
$ sudo serveradmin settings mail:setting
To view a group of settings:
You can view a group of settings that have part of their names in common by entering
as much of the name as you want, stopping at a colon (:), and entering an asterisk (*)
as a wildcard for the remaining parts of the name. For example:
$ sudo serveradmin settings mail:imap:*
General Setup
This section discusses basic conguration settings you make to use Mail service.
Conguring Outgoing Mail Service
Mail service includes an SMTP service for sending mail. Subject to restrictions that you
control, the SMTP service also transfers mail to and from Mail service on other servers.
If your mail users send messages to another Internet domain, your SMTP service
delivers the outgoing messages to the other domain’s Mail service. Other Mail services
deliver messages for your mail users to your SMTP service, which then transfers the
messages to your POP service and IMAP service.
Understanding SMTP Authentication
If you don’t choose a method of SMTP authentication or authorized specic SMTP
servers to relay for, the SMTP server allow anonymous SMTP mail relay and is
considered an open relay. Open relays are bad because junk mail senders can exploit
the relay to hide their identities and send illegal junk mail without penalty.
There is a dierence between relaying mail and accepting delivery of mail. Relaying mail
means passing mail from one (possibly external) mail server or a local user’s mail client
to another (third) mail server. Accepting delivery means receiving mail from a (possibly
external) mail server to be delivered to the server’s mail users. Mail addressed to local
recipients is still accepted and delivered.
Enabling authentication for SMTP requires authentication from any selected
authentication method prior to relaying mail.
SMTP Authentication is used with restricted SMTP mail transfer to limit junk mail
propagation. For more information about these settings, see “Understanding SMTP
Authentication” on page 26.
26 Chapter 2 Mail Service Setup