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There are 3 strands to the spam protection.
1. Greylisting
2. Spam filter
3. Content filtering
1. Grey listing
- Control - Greylisting can be turned on and off from the Settings | My Settings menu
- Usage - Whenever a new email comes from someone you have not had an email from before, your server will bounce the email back to the server it was sent from. If the email is legit, the originating server will attempt to deliver it again (usually within 5 minutes), our mailserver will accept the email on the reattempt. Once the email is accepted, that email address is then white listed and in future emails will be accepted without delay.
Most Spam is sent from servers other than that listed in the header of the email. If this is the case the originating server will not attempt to deliver the email again, so the spam mails will not come in to your mailbox.
2. Spam Filtering
- Control - Settings | My Spam Filtering controls how the server treats mail it considers spam. You can choose to receive all spam and suspected spam in your mail box or choose to have any combination of high/medium/low suspects 'quarantined' in your webmail 'Junk' folder.
Even mail considered as spam with a high degree of probability is not simply deleted, it's kept for you to review in the Junk folder.
- Usage - Override spam settings for this domain - Select this option to customize the way spam is handled.
- 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. The results of the weighting can be seen if you look at the headers for a particular email you've received.
- SPF Filtering Options Pass - Indicates that the email was sent from the server specified by the SPF record (more likely good mail). 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.
- SoftFail - 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.
- These SpamAssassin weights can only be changed at the system administrator level. See http://spamassassin.apache.org/ for more information.
- Trusted Senders - Email addresses (ex: ) 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. You can also add names to the trusted sender list by 'unmarking as spam'.
- To 'Unmark' any message as spam, click in the box to the left of the relevant message then click the Action menu and then Unmark As Spam. The miscategorised mail will be sent to your inbox and that sender will be added to the Trusted Sender list.
- See the SmarterMail help files at SmarterMail for the full documentation of all of the functions of SmarterMail.
- All mail is also scanned with AVG Professional and ClamAV for viruses before hitting your mailbox.
The section on Content Filtering... Coming soon.
