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Re:Mutt – Text-based mail client for Unix by mattpallissard on Friday June 10, 2022 @03:05PM (#31698162)
The search command is in the IMAP RFC [1]. Sieve is an entirely separate RFC for filtering email as it's accepted by the MDA [2].

And I could be wrong, but AFAIK neomutt at least supports server side search.

1. https://www.ietf.org/rfc/rfc9051.html#name-search-command 2. https://tools.ietf.org/html/rfc5228

Re:Mutt – Text-based mail client for Unix by cycomanic on Friday June 10, 2022 @04:18PM (#31698931)
Sorry you're obviously correct about sieve. Maybe I misremember about server side search in mutt (not sure if there is a difference to neomutt), but I remember imap search was very slow if caching was not enabled (IIRC there's even a warning in the mutt documentation about this).