Invalid 7bit DATA email bounce back error

bit of a strange one..

we have a user who gets this message sometimes when emailing a Comcast user.

-------------------------------------- rejected your message to the following e-mail addresses:

(recipient's address) gave this error:
Invalid 7bit DATA


I sent as basic message to the user, no bounce back, i sent one from our users account -  no bounce back.

question is could there be something in the email that my user is sending to cause this?  I have never seen this error before

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Since you are receiving this from their server and have no other issues I would say that it's either problems on their end, or a message that have been corrupted for some reason. Unless it's a frequent error from this specific client I wouldn't put too much effor into finding out why it happend.

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