So if we do all but the last step of the transfer, how do we initiate the e-mail to all the users with the info on how to setup their account on ? Do I just run the transfer process again and simply just choose the last option?
I don't know if that would work. Being a separate transfer it might send only to the zero members copied in that round. Unless the mechanism keeps track of prior transfers between the same group pairs. Unless someone here has actually tried it, you may have to ask [email protected] what would happen.
I would say just post a special notice in either or both groups, and include the info you want. The only thing "special" about the content of the You have been added email is that it contains an opt-out link for those who don't want to be in the Groups.io group.
A difference is who receives it. That notice, and your group's Welcome Member Notice would go out to all
of the copied members (but only the copied members) regardless of Email Delivery, something that's not quite true of
a Special Notice. Also, a Special Notice goes into the group's Messages
archive, whereas neither the You've been added nor the Welcome do.