Gmail covers almost everything I need. I still use Thunderbird to create temporary IMAP backups (so I have another backup besides Google Takeout) and also to transfer e-mails from multiple providers just by drag and dropping from their inboxes or the file manager. Or when I want to edit the header of an email so that Gmail doesn't group them up in a conversation, this is a very rare / edge case that allows me to still use the conversations feature.
Plus labels and filters allow me to automatically "tag" messages based on sender/domain/wildcards/other variables
I don't have a huge amount of emails but I manage 3 Gmail accounts using a single client (with inbox delegation) and also older Ymail and Hotmail accounts as POP3.
https://support.google.com/mail/answer/7190
Plus labels and filters allow me to automatically "tag" messages based on sender/domain/wildcards/other variables
I don't have a huge amount of emails but I manage 3 Gmail accounts using a single client (with inbox delegation) and also older Ymail and Hotmail accounts as POP3.