You will have to elaborate, I don't understand. Marker is here just to handle mail on server side and I can easly upgrade it to hash of hash + salt and handle it programatically on server but there was never any need for it. And anyway I couldn't care less, without it mail is invalid, still 0 spam. And I am doing it for last 10 years so it is battle proven.
I think the responder misread your message and assumed you were adding a suffix like \+\w+ to the end of your email addresses like
name@gmail.com -> name+suffix@gmail.com
Several email providers treat a + symbol as the end of the first part of the address and ignore everything between it and the @.
I think the responder’s point was that analytics providers just ignore things after a + too
