xfinity is throttling messages

user_22sv5m Thank you so much for your post for help with sending these group email messages. Our customers' personal Comcast email addresses are not meant for large mass mailing and can be considered a violation of the terms of use for our email accounts. Your messages may be marked as spam, causing security filters to impact your messages. Our Customer Security Assurance team may be able to help remove your domain from any blocks or spam filters, but the limits would stay in place.