Notes on Operating Your Own Mail Server
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For Dedicated Servers and Virtual Servers
Do you want to operate your own mail server? Please take the following points into account when setting it up:
Always configure the mail server so that only emails for email addresses that are actually created on the system are accepted. Make sure that the mail server does not accept emails for other domains. This way you avoid possible misuse of the server as an open mail relay (Wikipedia link).
Configure the server for SMTP-Auth. This ensures that users who have email accounts on the system can send emails to any recipient.
With SMTP-Auth, a user's email program must first authenticate itself to the server. Only then can emails be sent. When delivered, the pre-installed mail server (qmail) is already configured appropriately.