I stopped by this forum because I read the topic differently. I thought it would be about how to set up groups mail contacts in Gmail. I had some experience with that this past fall when I had a group of over 200. When I was sending out the group email, Gmail return them as non deliverable. After doing more investigating into my dilemma on Google, I found out that groups can only be like 50 big before Gmail does the non deliverable thing. I also found out through trial/error, I had to wait about 5 mins between each sent group email or Gmail would do the non deliverable thing. Then I got smart and through trial/error again, I found out if I went up to the 3dots at the top right of the window and clicked on history and deleted my previous history, I could email all my groups — 8 of them — without any problem. I am the editor of a Newsletter for the Resort that my husband and I winter at and I send our these weekly schedules to my 8 groups.