What other free options are out there? Proton Mail’s free plan restricts to only 3 folders.
EDIT: After careful discussion with others, I’ve reluctantly decided to stick to Gmail, because we don’t know if these other providers will still be around 50 years from now.
Which officials, banks and companies would know what to do with a PGP or S/MIME encrypted email anyway?
Also, can’t you free up storage by deleting the email from the sent folder?