Sergiy Zhuk writes:
Courier could probably benefit from header indexing, but the benefits are not obvious since most mail clients do this on their own anyway. I'd like to see a courier vs dovecot comparison, which is using Maildir with indexes to see if it makes sense to implement server-side indexing. It looks like it may make sense to do so, especially with large mailboxes (over 10,000 msgs in a single folder), but I couldn't find any hard data proving or disproving that.
Any benchmarking of benefits of using indexed headers should also factor in the performance hit of all other, typical, non-searching IMAP operations. It's a no-brainer that indexing messages, in advance, will benefit searching operations.
The question is whether the benefits of indexed searches overcome the overhead and the performance hit you have to take during all other non search-related operation.
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