What email client would you recommend for 500 mailboxes?

Question

Email

In which mail client is it more convenient to work with a large number of mailboxes (500+)? You need to be able to group mailboxes by folders or categories.

Answer 1

You can forward from your 500 mailboxes to a separate special one, and already there, using the usual rules, scatter letters into folders and categories.

Answer 2

500 never tried, but a couple of dozen boxes got along great in the bat and thunderbird.