Most of our email list is going to spam with recipients who have no problems with previous service

We copied our list of 179 emails of our church's members to Constant Contact and only 8 are getting through. The rest apparently are going to recipient spam or junk folders. All of the 179 go through with the prior service we were using. We are using the same "from" email address, but the sender is identified as Christ Episcopal Church in Constant Contact and just Christ Church in the prior service. Is it possible that the different sender name is triggering the spam and junk identifications. I've read various articles about how to resolve spam issues by asking recipients to go into their email settings and allow the emails. You know as well as I do that hardly anyone will trouble themselves to do that.