I have a contact which is a member of 2 groups and the status is "Added (by Email)" - i don't want this to be possible!
on the same day, the account i use for bulk email received a (no subject) email from the relevant contact to civimail+u.1421.81227.ac26f752ec18f10b@
The IDs of the groups in question are 14 and 10.
in civimail accounts i have a default "bounce processing" with localpart "civimail+" account which i understand is for all bulk sending.
I also have one without a localpart used for "email-to-activity" - i don't think i actually want this at all now i look, but it's there currently.
What is triggering the "added (by email)" group join, and how can i block it in the future? Thanks!