[mhfs]

I’m surprised no one mentions iCloud as a viable alternative. Reasons?

[robin_reala]

It doesn’t let you use your own domain, which massively increases the difficulty to move providers in the future.

[dankoss]

I like it, I use my custom domain as a spam filter and have a short me.com address.

[Rjevski]

No custom domains support would be the main one for me.