Mine is 7GB and the tool has no issues, don't see a reason it wouldn't scale. On my SSD ripgrep takes about 5 seconds in cold start to search over all of it, t

Mine is 7GB and the tool has no issues, don't see a reason it wouldn't scale. On my SSD ripgrep takes about 5 seconds in cold start to search over all of it, then less than a second after that (presumably because drive caches have populated). It may be enough if you only search mail infrequently, otherwise perhaps Recoll [0] indexer might help, I believe it can handle .mbox files (so each message would be indexed as a separate document) [0] https://www.lesbonscomptes.com/recoll/pages/features.html https://www.lesbonscomptes.com/recoll/pages/features.html