Comment by blibble
if people are worrying about importing their digital lives into fastmail from google workspace: you don't need to worry
I had been bitten by bad import tools in the past (e.g. Google's)
but fastmail's importer worked flawlessly
for each user transferred, after fastmail's import completed, I dumped out their old gmail (using gmail API) and their new fastmail (using jmap)
and diffed before/after
result: zero differences
perfect
When I joined fastmail I imported my gmail and also configured it to be able to fully use my gmail account via IMAP so I wouldn't need to sign into gmail at all.
I was also moving from a gmail address, so next I created a label that got attached to any email received to the old email address via that IMAP connection, which gave me a nice self-maintaining todo list for services that had not yet been updated to use a new email address.
I was also surprised by how flawlessly seamless the whole process was. It was a big factor in my selection of Fastmail over other competitors when I was making the decision to leave Gmail.