Comcast has put the following sending limits in place for our residentialXFINITY Internet customers:
  • An email message can be sent to a maximum of 100 recipients. Any messages sent to over 100 recipients will not be delivered.
  • XFINITY customers can email up to 1,000 recipients per day. If an account exceeds the 1,000-recipient limit, the account will not be able to send for the remainder of the day.
  • The maximum size of an email cannot exceed 25 MB; this includes attachments, headers, text, formatting, etc.

Thanks