Check if a email for another user has been successfully viewed
If I send an encrypted email to a non-protonmail user I'd like to be able to see if that user has accessed the email successfully. A symbol like a check-box in the inbox would suffice.
It could be combined with a counter of how many times the email has been viewed (as mentioned in another idea).
The punisher commented
Christopher Ris stop talking to my wife you feel me im tired of you mother fuckers trying to disrespect a married female Cindy keep it up Cindy has two of my kids and im her husband so im informing u back the hell away
I'm in favour of this feature as well.