Cannot send some emails from the address book. Comcast says it is not a server problem.

Keep getting this message when trying to send a group email from the address book -"The size of the message you are trying to send exceeds a temporary size limit of the server. The message was not sent, try to reduce the message size or wait some time and try again. The server responded: 4.1.1... temporary failure."
Comcast has checked it - the issue is not the server they say. This problem just started 4 days ago. It appears other people have this problem on the thunderbird forum and it has not been resolved yet.

The Comcast server is issuing the error message. Have them explain how this is not their problem.

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