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Recommended SPAM Settings
SmarterMail comes equipped with several industry-standard antispam options that can block up to 97% of all spam from entering or leaving the server and help keep mail systems running smoothly, including bayesian filtering, SPF, reverse DNS, greylisting and more. However, when considering your spam configuration, it’s important to remember that spam administration is not a "fire and forget" task. Using these built-in options requires constant tweaking to keep that level of effectiveness, and mail administrators will need to monitor incoming and outgoing spam as spammers frequently change their tactics. (Learn more about configuring the built-in antispam options below.)
This is where the Message Sniffer and Cyren Premium Antispam add-ons come in handy. These third-party services act as additional spam checks and may be worthwhile investments, as a multi-tiered solution is the best course of action when it comes to dealing with spam. Often times, users are not satisfied 97% spam protection -- keeping in mind that, at this level of protection, for every 100 messages a user receives per day, at least 3 of these could be spam. Both Message Sniffer and Cyren will catch a higher percentage of spam than the default options, and better yet, neither require consistent updating by the SmarterMail administrator. Using one of these services, or ideally both together, is easily the most effective option in battling spam.
Below are some recommendations for the various spam settings SmarterMail has to offer. Please keep in mind that these are only suggestions. Administrators can, and should, keep an eye on these settings and adjust them as necessary to concoct a viable antispam solution for their end users.
Follow these steps to review your spam settings:
- Log into SmarterMail as a System Administrator.
- In the navigation pane, click on Antispam.
Low Probability of Spam weight = 10
Medium Probability of Spam weight = 20
High Probability of Spam weight = 30
Weight = 10 (spam weight assigned to a message if it fails Bayesian filter test)
Max. Memory to allocate for filtering = 10MB
Message required for filter update = 500
Pass weight = 0 (Sender’s IP is valid for sender’s domain)
Fail weight = 30 (Sender’s IP is not valid for sender’s domain)
Soft Fail weight = 10 (Sender’s IP is questionable for sender’s domain)
Neutral weight = 0 (No strong statement can be made for or against sender’s IP)
PermError weight = 0 (The SPF record could not be processed.)
None weight = 0 (SPF is not commonly adopted therefore, we suggest setting this to 0)
Weight = 10
Weight = 10
Weight = 10
Weight = 10
Additional RBLs can be added and weights applied.
Default Action: Prefix subject with text
Text to Add: SPAM-LOW
Default Action: Move to Junk E-Mail folder
Text to Add:SPAM-MEDIUM
Default Action:Move to Junk E-Mail folder
Text to Add:SPAM-HIGH
On the Greylisting Options card within the Options tab, you can enable greylisting. Greylisting is a popular method of fighting spam as it temporarily rejects unrecognized incoming emails that are not sent by whitelisted or authenticated users, effectively saying, “Try again later.” Valid servers will retry the email a short time later, which would be permitted and delivered. Spammers, on the other hand, rarely retry on temporary failures, therefore reducing the amount of spam that customers receive. Find our recommended values below:
When it comes to antispam administration, it’s important to keep in mind that spammers change their tactics often and each installation/setup is unique. What one person may consider the ideal spam configuration, others may find too restrictive. What works for one mail server, may not work for all. Discussing your configuration with other server administrators is a great way to get ideas flowing on what will work best for you. If you’ve still got more questions or want additional ideas on how to configure SmarterMail’s antispam, please consider posting in the Community or reviewing one of the many threads discussing antispam topics.
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