What mail client under windows will be faster on large volumes of mail?

Question

Email

Interested in what you can switch to from The Bat, several boxes, total volume - 300GB
Works, but slows down, what to switch to?

Answer 1

I doubt very much that the volume of mail you have because of the number of letters. Most likely because of attachments.
Maybe it makes sense to send attachments to a separate folder and delete letters?
TheBat has an option to "store attachments separately", but I recommend not to do this on the main mailbox - make another "archival", set up storage of attachments separately in it, and transfer old letters to an archive mailbox with folders by year or whatever you prefer.
Specify what exactly slows down - when TheBat exits, it can compress / check different folders. This can be disabled for those folders where you rarely delete emails.
I highly recommend in ANY email client, and especially TheBat, not to store a lot of letters in Inbox, which most often twitches when checking mail - read it, transfer the letters to some folder of used ones. Then the inbox compression/checking will be instantaneous, and the rest of the folders will practically not be checked.

Answer 2

Thunderbird - 4Gb limit per 1
Outlook folder - 20Gb per email database file (usually 1 account)
If your emails are not scattered into subfolders, any client will slow down.
The usual recommendation is to make folders by year / quarter and throw letters there for the past period

Answer 3

Unfortunately, clients do not make any email with the expectation of a large volume of mail.