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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for What an email filter filters:

SPAM: What an email filter filters
SPAM: Email filter target
ANTISPAM: Like many email filters
SPAM: What email filters block
SPAM: Filtered email
ANTISPAM: Like some email filters
IMAGESPAM: Emails meant to bypass text-based filters