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I’m confused

Mail delivery issue to a email


I'm from belgium, not a comcast customer trying to email some guy who is a comcast customer.
Let's say his email address is something like
Everytime my email is bounced with that error message:

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients was aborted after 0 second(s):


Final-recipient: rfc822;
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp; 550 5.1.1 No such user here

I have emailed, but I'm told delivery failed to

See the difference between badbob25 and 29?

I'm sure I have emailed badbob25, I have tried from different computers, different browsers, even from my phone....
I have tried using different email addresses, copying and pasting the badbob25 email address, typing it directly

That's driving me crazy.

Thank you
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