Use the Name, not Full Name. The Name field is a slug which identifies the group and is used everywhere from @ mentions to in-page styling. The full name is just a friendly name to present to users.
Are these emails(ivites) sent with any interval of time?
I wouldn’t want the SESto consider it spam, etc., etc. How does it work? Is it safe?
I would like to invite (transfer 3000 users) from the old forum and is this the best way to do it?
Or maybe it’s better to use an autorespnder or a sendy, etc.?