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has 1 follower and 61 67 uses:

Actions performed automatically on incoming or outgoing messages, based on conditions that you specify.

has 0 followers and 48 51 uses:

Email filters allow custom actions to be performed when a message satisfies the filter/rule requirements is received. An example of a common email filter is spam protection, which automatically moves all incoming messages into a Spam folder (action), when a given message is determined to be "spam" (rule).

Based on their definitions, these tags are clearly synonyms. I'd like to merge them. has the slight edge in usage, so I suppose should be made a synonym of that.

  • I partly agree, because I don't think most people make much distinction. For me, a rule is something users do on their E-mail client and filters are something I apply at the MTA level, but its mostly a distinction without a difference. – mikebabcock Sep 12 '14 at 14:06

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