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Emails not arriving to Comcast.net accounts

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Emails not arriving to Comcast.net accounts

Hi there!  mIn addition to being an Xfinity customer, I am also a Comcast Business customer through my work.  We are a public library that is sending hundreds of overdue notices a day via a third-party vendor (yes, or SPF records are all set correctly to allow this securely).

 

Since Saturday, there have been periods during which my vendor who sends these messages is receiving bouncebacks from Comcast email servers.  They are 550 errors, and they all indicate that the "User is Unknown", or the "User doesn't exist"...some varying error text but the theme is the same throughout. This includes messages bound for my own comcast.net account, so I know that's certainly a valid address!

 

A lot of these addresses have received messages in the past. We know they are valid.  It seems to indicate that there is some issue between Comcasts gateway servers and their mailbox servers.  Anyone else noticing this?  We've been able to send once since then, but since we send two batches a day, we've seen that some batches go out fine. Others get bouncebacks from every comcast-bound notice we send out.

 

Is something going on in the Comcast world?  We have no issues sending to other mail domains at all.  THANKS!

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Official Employee

Re: Emails not arriving to Comcast.net accounts

Could you send me a private message with the full bounce message?  I suspect this is not a problem on your end, but I want to look at the bounce to be certain (and don't want you to publicly publish the email addresses involved)





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