Forum Discussion

John2222's avatar
5 years ago

Emails to me from being rejected. AUP#CXBL error 554 5.0.0

I recently discovered that all emails sent from are NOT getting to my Cox email account ( and also same problems to another email ( are also being rejected. SEE EMAIL error messages below:

----- The following addresses had permanent fatal errors -----
(reason: 554 cmsmtp blocked. Refer to Error Codes section at for more information. AUP#CXBL)

----- Transcript of session follows -----
... while talking to
<<< 554 cmsmtp blocked. Refer to Error Codes section at for more information. AUP#CXBL
554 5.0.0 Service unavailable

I can't believe that all emails from Rice University ( are being blocked.

How do I resolve this?

3 Replies

  • bearone2's avatar
    Contributor III

    blocked or in website spam folder?

    every time i come to the forum i also check webmail & generally find 3-12 items in spam folder & not all are from questionable senders.

    • John2222's avatar

      blocked.  The other person sending the original email gets 554 ... bounce back / reject email.

      I have emailed details to and to but have not received a reply from either one.  Any idea how long it takes for them to respond?

      • KevinM2's avatar
        Former Moderator
        Hi John2222, due to the high volume of emails received, a personal response is not provided to each report. Please do not interpret a lack of response as a lack of action. Our strict compliance with our privacy policies and applicable legal requirements prevent us from revealing any personally identifiable information about a customer without proper legal documentation.

        Similarly, we cannot disclose any specific action taken against a customer as a result of an abuse complaint.

        Lastly, Cox Abuse can only take action against the abuse that originates from its own network. -Kevin M. Cox Support Forum Moderator