Filter Order

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Filters are processed in a specific order. Once a filter determines an email is spam, all the following filters will be skipped.

 

Following is the order of the filters. In red are the blacklists, in green the whitelists:

 

Cached IP blacklist

Greylist

Whitelisted IP

Whitelisted Email Address To

Whitelisted EMail Address From

Whitelisted Email From Domain

Whitelisted Auto White List Force Delivery

Allowed Domains

Local IP Blacklist

Local Domain Blacklist

Local Emails Blacklist

Local Emails TO Blacklist

Not in Authorized TO Emails

Country Blacklist

Reject No Reverse DNS

Reject Empty Mail From

Reject Same To From Email address

Reject if Recipient's email in Honeypot email list

Reject if IP in Honeypot-generated auto-ban list

Reject Same To From Domain

Recipient Count > Max RCPTTO

MX Record check

SFDB Filter

SPF Filter

MAPS check

Keyword Whitelist

SFCD Filter

Blank emails with attachments only

Spam Images in PDFs

Attachment Filter

Keywords

Image Filtering

Bayesian Filtering

SURBL check

Antivirus Plugin