Simultaneous mail list authorization?

Question

Email

Good afternoon! Please tell me the best way to solve the problem.
There is a list of mails on different services (mail.ru, yandex, rambler, hotmail) about 100-200 pieces. You need to search for keywords in the letters contained in our emails and download the letters. Doing it by hand is not an option.
I've been looking for thunderbird plugins but can't find anything.
Tell me where to dig? What to look for?

Answer 1

search in all boxes is in the bat
, you can write a program and search through the imap probably.

Answer 2

It would be possible to use
www.athensfbc.com/imap_tools/details.html
with the -z option, but IMAP SEARCH is not supported anywhere and I'm not sure what will work without it. If the boxes are not very large, you can try to set up the collection of mail in one box (for example, from 100 boxes to 10 and from these 10 to 1) and search in the resulting box.