Oh. And personally I am using mailbox.org which is also nice but a little bit cheaper. And the feature-set is still great, but limited compared to FastMail. Also the webui in mailbox.org is slower than for fastmail.

I'd recommend Posteo [1] and Mailbox [2] to people mainly for the costs. They're cheap and are a lot more flexible in pricing as your needs grow.

Fastmail becomes terribly expensive once you realize you need multiple accounts (not just aliases) for different people in the family. At least for me, paying a few hundred dollars on Fastmail (or anywhere else) for email is really way too expensive. I've also written to Fastmail asking for flexible pricing options, but they responded that they're not even considering any changes on pricing/flexibility for the near future.

Edit: If one doesn't need custom domains and office suites, I'd recommend only Posteo! That company is way ahead of others in being better for all humans (read on their website about all the things they do).

[1]: https://www.posteo.de

[2]: https://www.mailbox.org

one nice thing about mailbox.org is that you can have them encrypt incoming email with PGP. Allows you to use IMAP and get protonmail/tutanote-esque security... I really like it :)

I used Fastmail until I found that they have a hardcoded limit of 128 IMAP flags per mailbox. I switched to G Suite - they have no such limitation.