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:
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:
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.
Selecting the Use of short and full names is allowed option will allow users to log in to their mail accounts by specifying only the left part of e-mail address before the @ sign (e.g. username), or by specifying the full e-mail address (e.g. username@your-domain.com).
To avoid possible authorization problems for e-mail users who reside in different domains but have identical user names and passwords, we recommend that you choose the Only use of full mail account names is allowed option.
Note: If you wish to set up anti-spam systems, such as SpamAssassin spam filter, or protection systems based on Trend Micro RBL+ service (formerly known as MAPS) or Sender Policy Framework (SPF), proceed to the Setting Up Anti-Spam Protection section.