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Rule "missing hyphen in 'mail in'"

This is one of many errors that LanguageTool can detect.

Description: missing hyphen in 'mail in'
Message: This is normally spelled with a hyphen.
Category: Grammar (ID: GRAMMAR)
Link: https://languagetool.org/insights/post/hyphen/#compound-nouns-with-and-without-hyphens
Incorrect sentences
that this rule can detect:
  • The postal crisis has states looking for alternatives to mail in ballots.
    Correction suggestion: mail-in
ID: MAIL_IN_HYPHEN [1]
Version: 6.6-SNAPSHOT (2024-11-24 22:33:09 +0100)