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I read about Spark when it first came out. I didn't like the way it needed to store all my account passwords so it could download the mails itself in order to ping me and tell me there were new ones.

It's been going a while now and I'm sure it's a respectable company, but at the time it was new and I didn't trust it. I gave it a go on my phone with a little used account and didn't like it. I don't get hundreds of mails and don't need any type of auto categorisation*, or snooze type features.

I've also tried Outlook, but it fails at something I need regularly, and that is having multiple addresses linked to a domain. Such as sales@domain.com info@domain.com personal.mail@domain.com etc. Apple Mail (iOS and MacOS) handles multiple reply-from addresses beautifully.

Plus, MacOS Mail is scriptable. I have an Applescript that takes a year as input, and finds every mail received/sent in that year and copies it to an "On My Mac" folder. I could, if I wanted, then trash them from my IMAP accounts, although I don't usually bother.

* I've turned off the iOS 18 categorisation option - I'm sticking with ye olde List View.

This is a valid annoyance, though. I also wish it could be disabled.
 
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MailMate would have been my recommendation until last December when the developer announced a "voluntary subscription" for it. I can absolutely understand his reasoning, and I won't say MailMate is a worse software now (it is still amazing!), but I have decided against software that introduces subscriptions (because they will always be mandatory after some time).

I have moved on to mu4e which is a great choice if you use GNU Emacs anyway, which I do.
 
I used to enjoy using Postbox. Keyboard shortcuts in reading mode were the killer feature for me. I only stopped using it because my employer at the time changed the Outlook/Exchange config so Postbox could no longer read mail.

It seems Postbox were recently acquired by eM Client, which is an integrated email/calendar/etc client I had never heard of. It looks potentially good, especially for a power user. Has anyone tried it?
I'm using eM Client both on MacOS and Windows.
It is not cheap but excellent for power users.
It is very, very customisable and has many advanced functions as signing with digital certificate, delivery and read receipt, tracking prevention, advanced search and many more.
 
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