The basic is just to run away from Gmail, but it's not easy.
Alternatives?
I just tried Protonmail (the paid account, of course), but it's a pretty sad experience so far. The huge gmail feature that is missing is the lack of full text search: yes, you cannot search in the body of your past email (to me this, in 2018, is not acceptable)
The other big issue is import data from Gmail. I had 10Gb of data in Gmail, so I paid Protonmail for a 15GB storage, then realized soon I could not import my data: here there are some issue
1) you cannot connect to protonmail IMAP without their Protonmail/Bridge (which is pretty understandable for security) and using a Thunderbird/Outlook client, in theory, but:
2) there is no Protonmail/Bridge for linux (only Win + Os)
3) the Windows version of Protonmail/Bridge crashes very often (I did file a bug of course), and it crashes mostly during an import (so I even ended up loosing emails)
4) the Protonmail/Brige is, after a while, very slow: I see I am not the only one which thing there is a throttling check
From the Gmail side, keep in mind there are very strong limits on the amount of data you can transfer, so keep it in mind before purchasing Protonmail storage https://support.google.com/a/answer/1071518?hl=en
Alternatives?
I just tried Protonmail (the paid account, of course), but it's a pretty sad experience so far. The huge gmail feature that is missing is the lack of full text search: yes, you cannot search in the body of your past email (to me this, in 2018, is not acceptable)
The other big issue is import data from Gmail. I had 10Gb of data in Gmail, so I paid Protonmail for a 15GB storage, then realized soon I could not import my data: here there are some issue
1) you cannot connect to protonmail IMAP without their Protonmail/Bridge (which is pretty understandable for security) and using a Thunderbird/Outlook client, in theory, but:
2) there is no Protonmail/Bridge for linux (only Win + Os)
3) the Windows version of Protonmail/Bridge crashes very often (I did file a bug of course), and it crashes mostly during an import (so I even ended up loosing emails)
4) the Protonmail/Brige is, after a while, very slow: I see I am not the only one which thing there is a throttling check
From the Gmail side, keep in mind there are very strong limits on the amount of data you can transfer, so keep it in mind before purchasing Protonmail storage https://support.google.com/a/answer/1071518?hl=en