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Incoming Emails Blocked - Sender Receives Msg 550 5.1.0 sender rejected. Code AUP#In-1310

JC9
JC9 Posts: 12 Participant
edited January 9 in Email

I have a long time friend who has sent 100's of emails in the past few months, always from the same [username]@gmail.com account, to my same [username]@twc.com account. I don't mean 100's in a short period of time, more like just a few per day at most.

I received emails from this person without issue for years, including the 5th, and 6th of this month, then suddenly on the 7th, the emails sent to me bounced back to sender with the following message:

The response from the remote server was:

550 5.1.0 sender rejected. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes for more information. AUP#In-1310

I looked up this In-1310 on Spectrum's site and it just shows 1300-1340 is "Spectrum limits the number of concurrent connections from a sender, as well as the total number of connections allowed. Limits vary based on the reputation of the IP address. Reduce your number of connections and try again later."

This does not make a lot of sense to me as the sender of these emails is not bulk emailing anyone, just sending an email at a time and AFAIK, I am the only recipient with a Spectrum email account. The sender is not getting bounced back emails from any other person/destination they are being sent to.

Further, after these bounced back emails, during further testing, the sender was able to send emails that made it through to my same email account without bouncing back. This same situation also happened a few weeks ago, for the first time ever as far as I know.

I don't see how this could be a case of excessive concurent connections or total # of connection allowed, unless Spectrum is sporadically blocking all of gmail, and how could that work out well, considering how popular gmail is?

Comments

  • James_M
    James_M Posts: 5,147 ✅ Verified Employee Moderator

    It sounds like the senders email or IP address was flagged as spam. You can try adding them to the safe senders list or you can ask them to test sending to a different email. If it was flagged by the automated process, this also usually resets automatically.

  • JC9
    JC9 Posts: 12 Participant

    It seems strange though, I checked the webmail and the messages weren't flagged as spam there, and since they came through on the 5th, and 6th, but not the 7th, and now coming through again on the 8th and 9th.

    The topics of conversation don't include anything that I would suspect of tripping a spam filter.

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