Domain Spam Filtering
This will provide anti-spam measures that will help protect users from unwanted mails. To manage Spam Filters, access Filters >>> Spam Filters. The domain administrator can choose to use the spam options set by the System Administrator by leaving the selection to Use default spam settings. Alternatively, the domain administrator can use Override spam settings for this domain to customise the spam options. After making this selection, the domain administrator should choose Actions and select what should happen to the spam messages.
Spam check weights
Each type of spam check has an associated weight that factors into the spam probability of a message. When an email comes in, all of the checks listed are run, and for each check that the message fails, the weight is added to the overall score of the email. The thresholds for each spam probability are examined, and the email is placed into the appropriate category.
SPF Filtering Options
• Pass – Indicates that the email was sent from the server specified by the SPF record. The weight you set may be 0 (for no effect) or a negative number, thereby reducing the spam rating.
• Fail – Indicates that the email was sent from a server prohibited by the SPF record (highly likely spam).Set this to a relatively high weight, as the probability that the email was spoofed is very high.
• Soft Fail—Indicates that the email was sent by a server that is questionable in the SPF record. This should either be set to 0 or a low spam weight.
• Neutral – Indicates that the SPF record makes no statement for or against the server that sent the email. Except in very special circumstances, leave this set to 0.
• PermError – Indicates that the email sender does not publish an SPF record or there is a syntax error in the record. Since SPF is relatively new, many legitimate domains do not have SPF records. It is recommended that you leave this at 0 until SPF becomes more popular on the internet.
When you choose to override the spam options set by your system administrator, you get to choose the actions that are taken when email comes in that has a low, medium, or high priority of being spam. For each spam level, choose the action you wish to have taken. If you chose to add text to the subject line of messages, enter in the text in the box below the action drop down.
Trusted Senders – Email addresses (ex: email@example.com) or domain names (ex: example.com) can be added to the domain list of trusted senders. When email comes in from a trusted sender, all spam filtering for that email is bypassed. Enter one email address or domain name per line then click on Save.
A Domain Alias is an alias for a secondary domain name that points to an existing email account on the server under an existing primary domain name.
For example, a full email addresses requires a user name and a domain name (ex. firstname.lastname@example.org). If you add a domain alias on a secondary domain like “example-alias.com” then not only will “email@example.com” be valid, but the same mailbox will also work with “firstname.lastname@example.org”. If an email was sent to both emails then the “user” mailbox would get two copies of the emails.
A user cannot log into the web interface under a domain alias, just the original domain, nor can a user send an email from the domain alias. Remember, any alias is simply a pointer to an existing email account on the server.
Domain Folder Auto-Clean
Domain Folder Auto-Clean is a method for limiting how much of your account disk space is used by the Junk E-Mail, Sent Items, and Deleted Items folders. By placing limits on the size of these folders, you can help ensure that your domain accounts do not fill up unnecessarily. Oldest messages will be deleted from the folders first. If you override the auto-clean settings, the settings you choose will trickle down to your users.