You can actually do this with sieve filters if you are clever in the programming. You can make a filter that checks a list of known addresses (or aliases wink wink) and then if a sender does not match those addresses, to move the email to trash and send an auto message. Note you have to have proton plus for the auto reply and it does count against your sending limit.
You can actually do this with sieve filters if you are clever in the programming. You can make a filter that checks a list of known addresses (or aliases wink wink) and then if a sender does not match those addresses, to move the email to trash and send an auto message. Note you have to have proton plus for the auto reply and it does count against your sending limit.