Which client should I choose to work with 100 mailboxes?

Question

gmail

I have about 100 accounts on the mail ya.ru, gmail, mail.ru (hairstyles for all mailboxes receive letters with keys).
at the moment everything is working on Thunderbird (but I constantly get errors that it was not possible to connect to the IMAP server) at the very moment when all mailboxes knock on the ya.ru server :) if there is a solution that will work effectively? so that all the boxes work, no one falls off!

Answer 1

I would just set up a redirect to one mailbox and make filters, so that later I would figure out what came from which mailbox.

Answer 2

There are actually not so many mail clients. TB, Outlook, The Mouse and Zimbra mail client are the only ones I know of, except for those that don't work on Windows.
The problem is not with the client. Any client will fall into a stupor when he starts to break through hundreds of accounts at the same time . Get another one or two or ten accounts and redirect mail there so that it is grouped on them, and already take them from them.

Answer 3

Try switching from IMAP to POP3 for at least some of your mailboxes.