[peterwwillis]

Back when Fetchmail would segfault on certain spam messages, and a bug report to ESR went nowhere, I wrote my own mail fetcher in Perl. Then I extended it to IMAP, and later IMAPS, working around some bugs in some popular IMAP servers. I had it deliver mail to a local mda (so I could use Maildir and mda filters) and configurable to keep or delete mails from the remote server. I think it only supports one remote mailbox, however. https://github.com/psypete/public-bin/blob/public-bin/src/po... (It's very old code that sucks, and not secure, fwiw)

[jwilk]

I guess fetchmail is more stable now. I've never seen any crashes, and I've been using it against IMAP servers for at least a decade.