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It's likely that regular Fastmail users are subsidising their AI costs. I've talked to several people who were a bit shocked when Fastmail decided to complicate their offering with the current hyped trash.
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Are you thinking of some other company? The most Fastmail has done in LLM directions is offering an MCP API: https://www.fastmail.com/blog/an-mcp-server-for-fastmail/.
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i have been using posteo.de for the last decade with no problems at all. Exactly the feature set you use. I only recently started to use their Caldav stuff which works.

I recommend them.

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Same here. I don't want a custom domain for certain things, and Posteo (posteo.de) was good. Posteo increased the mailbox storage to 4 GB recently and the default number of free aliases too. I'm satisfied that it's run by a team and not by one person (the low bus factor mentioned above). At EUR 1 per month, it's way cheaper than Fastmail for multiple mailboxes across family members and provides a lot more value, IMO.
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