When an email is sent from Trello through a Butler automation, it automatically adds me as a member to the card (even though I have not asked for this, I did create the automation).
This is the automation for example:
when a card is moved into list "Dispatched" by anyone, move the card to the top of the list, post comment "@reply Order ({%card.name%}) has now been dispatched. Thank you for your order and we look forward to working with you again in the future.", and remove all the members from the card
Once it has done this, the Sendboard Bot, adds myself back to the card.