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I use beets for that.
https://beets.readthedocs.io/en/stable/guides/main.html
It’s a bit of a learning curve, though.
But I have developed a nice little README to remind myself how to do the basics.
It’s better than using a crappy GUI, or paying for something I will only ever use rarely.
Mailfence and Protonmail.
Mailfence has shorter inactive account policies which result in account deletion, and its login sessions are terminated very quickly.
I have also experienced multiple mail receipt failures because of instable mail servers in their pool, but that was back in December, and never recurred.
I only use Mailfence for throwaway emails.
Doctors Without Borders is my go-to.