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Did you notice that new Comcast bounce?


Deliverability folks from a few different email sending platforms have mentioned seeing a new bounce from Comcast, in response when trying to mail certain comcast.net subscribers:

550 5.2.0 <xxxxxxxx@comcast.net> - Account Closed, Please Remove

What does it mean? Nobody home! That's a dead account. The user is an ex-parrot. Send them no more mail. Seems simple enough to me, but people always have questions about this kind of thing, so I figured I'd share it with you all.

And of course, there's still this usual bounce:

550 5.1.1 <xxxxxxxx@comcast.net> - Not our Customer

Meaning that's not a valid Comcast subscriber address, either. Same deal, nobody home. It likely means nobody was ever home at that address, but even if I'm slightly wrong about that, the net here is the same; time to stop mailing that address.

And then there's also a slightly rarer 4xx bounce that looks like this:

450 4.2.0 <xxxxxxxx@comcast.net> - Recipient temporarily unavailable

Those ones, you should retry per a reasonable 4xx retry schedule.

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