The Panel works in cooperation with mail server software, which provides e-mail services for mailboxes and mailing lists. 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.
By default, the Postfix mail server is installed on Parallels Plesk Panel for Linux platforms, and MailEnable mail server, on Parallels Plesk Panel for Windows platforms. You can install another mail server software, if it is supported by your Panel, and then set up the Panel for using it.
If you want to use a mail server running on a separate machine, or want to prohibit your users from operating mail services, you can remove from the Panel all controls related to managing e-mail services and adding new mail accounts. This option does not actually switch off the Panel-managed mail server, but only removes the following items from the Control Panel accessed by hosting service customers and their users:
To hide the user interface elements related to mail services from the Control Panel:
To use another mail server software with your Panel (currently supported only on Windows hosting):
The mail server you have installed should now be displayed in the list of available mail servers.
The Panel will start using the new mail server without any need for server restart. Note that you can always select another mail server at any time later.
To view or configure the mail service settings:
There are five levels of strength:
According to the calculation algorithm used by the Panel, the strongest password meets the following criteria: it is more than 8 characters in length, contains a combination of letters in mixed case, numbers and special characters, like !,@,#,$,%,^,&,*,?,_,~.
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.
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:
Note for Windows hosting users: If you do not wish to use relay restrictions for networks that you trust, specify the network IP and mask in the Use no relay restrictions for the following networks: field (e.g., 188.8.131.52/16) and click the icon. To remove a network from the list, click the icon corresponding to the network you wish to remove.
The relay hosts on the networks in the list are considered not to be potentially operated by spammers, open relays, or open proxies. A trusted host could conceivably relay spam, but will not originate it, and will not forge header data. DNS blacklist checks will never query for hosts on these networks.
There is also an option to allow open relay without authorization, which, by default, is hidden from the user interface. Opening mail relay without authorization is not recommended because it allows spammers to send unsolicited mail through your server. If you want to set the open relay, log in to the server's file system, locate the file
root.controls.lock in your Parallels Plesk Panel installation directory (
PRODUCT_ROOT_D/var/root.controls.lock on Unix and
PRODUCT_DATA_D/var/root.controls.lock on Windows platforms) and remove the line
/server/mail.php3:relay_open from this file. The open relay option will show in your control panel.
Note: If you wish to set up spam protection systems, such as SpamAssassin spam filter, or protection systems based on DomainKeys, DNS blackhole lists or Sender Policy Framework (SPF), proceed to the section Setting Up Spam Protection.
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 (for example,
username), or by specifying the full e-mail address (for example,
To avoid possible authorization problems for e-mail users who reside in different domains but have identical user names and passwords, we highly recommend that you choose the Only use of full mail account names is allowed option.
Once you have set your mail server to support only full mail account names, you will not be able to switch back to supporting short account names until you make sure there are no encrypted passwords for mailboxes and user accounts with coinciding user names and passwords residing in different domains.
Please send us your feedback on this help page.