[sealjam]

I think the responder misread your message and assumed you were adding a suffix like \+\w+ to the end of your email addresses like [e-mail] -> [e-mail]

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

[dhimes]

Yes, that's exactly what happened. Oops.