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Re:Tell HN: I just open-sourced the e-mail client I spent 2 ... by jamespo on Friday October 07, 2011 @05:52PM (#3086150)
there's the mutt header_cache directive which can help

although if you have 100k+ emails in a folder, particularly a non-archive folder I'd suggest you're doing it wrong

Re:Tell HN: I just open-sourced the e-mail client I spent 2 ... by pyre on Friday October 07, 2011 @09:38PM (#3086724)
header_cache only works with Maildir and IMAP. If he's using Maildir for a mailbox w/ 100k+ emails, then he may start running into filesystem limitations.