loving the app so farExcept they use yahoo which has been hit be several security breaches which would likely affect more then just yahoo only accounts.
Here are the instructions for importing:
https://www.fastmail.com/help/receive/migratemail.html?u=c61b4144
I have about four times that in my gmail and decided not to import them. Fancied a clean break.
for Gmail
managed to delete my gmail account junk to under 2GB so less £ per month outgoing with fastmail