Downside is that their main servers are in the US, which may be problematic these days if you are from outside the US.
I just moved away from Fastmail after 10+ years for this reason.
I just moved away from Fastmail after 10+ years for this reason.
any avoidable dependency on the US has become a red line
don't forget to tell fastmail that the reason you're leaving is because they host in the US!
(I also told them if they open a DC outside the reach of the US regime: I be happy to become a customer again)