62 Configuring and Maintaining Your Server
Configuring Mail Services
Your control panel works in cooperation with Qmail mail server, which provides mail
services for your domains. After installation the mail server is configured automatically
and is ready to serve, however, we recommend that you review the default settings to
make sure that they satisfy your needs:
1 Click the Server shortcut in the navigation pane.
2 Click the Mail icon in the Services group. The server-wide mail
preferences screen will open on the Preferences tab.
3 If you wish to limit the size of an e-mail message that can be sent
through your server, type the desired value in kilobytes into the
Maximum letter size box, otherwise, leave this field blank.
4 To protect your server against unauthorized mail relaying or injection
of unsolicited bulk mail, select the Enable message submission check box
to allow your customers to send e-mail messages through the port
587.
Also notify your customers that they need to specify in their e-mail programs'
settings the port 587 for outgoing SMTP connections, and be sure to allow
connections to this port in your firewall settings.
5 Select the mail relay mode.
With closed relay the mail server will accept only e-mail addressed to the users who
have mailboxes on this server. Your customers will not be able to send any mail
through your outgoing SMTP server, therefore, we do not recommend closing mail
relay.
With relay after authorization, only your customers will be able to receive and send
e-mail through your mail server. We recommend that you leave the authorization is
required option selected, and specify allowed authentication methods:
POP3 authorization. With POP3 authorization, once a user has successfully
authenticated to the POP server, he or she is permitted to receive and send e-
mail through the mail server for the next 20 minutes (default value). You can
adjust this interval by specifying another value in the lock time box.
SMTP authorization. With SMTP authorization, your mail server requires
authorization if the e-mail message must be sent to an external address. Your
mail server supports LOGIN, CRAM-MD5 and PLAIN methods of SMTP
authorization.
6 If you wish to protect your users from dictionary attacks by not
allowing them to use simple passwords, select the Check the passwords
for mailboxes in the dictionary option.
A dictionary attack is when someone tries to find out a valid user name and
password by running a program that tries different combinations of dictionary words
in different languages. Dictionary attacks can be successful because many users
choose their passwords carelessly.
7 Select the mail account name format.
