emails with 7 recipients are blocked
In Catalina (laptop) and Mojave (imac) my emails that are sent to a group of 7 are not received by them (using gmail) and emails they send to me are blocked by icloud mail. The emails I send show as sent in my email and there is no blocked message. The emails they send to me give them a "blocked/bulk" message for my email address. I can send to 2 or 3 of them without a problem, and if they send to just me or me+2, they go through. It is when we go over 5 recipients that there is a problem. Please help, this is an important work group of 8 people that all need to be in the loop.
iMac Pro