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Unhappy100's avatar
New Contributor

Blocked emails from gmail accounts

I have been a cox customer for 17 years. Over the past month, I have not been receiving email messages from gmail users. I contacted cox customer service and was informed that this is intentional and that gmail has been sending too much spam so cox is blocking the emails addressed to multiple recipients. She was not helpful at all and suggested I let gmail know. There is not much gmail can do if people are creating accounts and sending spam from them. How about all of the accounts that are sending critical information and not spam. I am beyond unhappy with this, as my children's coaches, various nonprofit associations, etc. all have gmail accounts and send email to a multiple recipient list. I question how cox has the discretion to block MY emails. If my account is getting spammed that is my business. Right now, I am struggling trying to stay in the loop since I am not receiving my emails. This is a terrible practice and after 17 years, I am considering dropping cox for all of my services because of this poor business decision.

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  • Tecknowhelp's avatar
    Valued Contributor II

    Have you tried sending your Cox email a test email from a Gmail account? If so, does it bounce back with a error? Any difference if you send the Gmail from their webpage vs a email client?

    I just send myself a test email from Gmail to Cox and it went through without a issue so there isn't a general block. One that that has recently changes is they are pushing TLS for all SMTP.   Not all email providers are working with them though, see here for which one support. 

  • Unhappy100's avatar
    New Contributor

    It is only affecting multiple recipient emails and I have tested it and it bounces back every time.

  • DNK's avatar
    New Contributor

    You are not alone. The same thing has been happening to me and other people:

    I also contacted cox support and had an experience that was very similar to yours. The person I talked to was not helpful at all and extremely unsympathetic. Additionally, no one from cox has replied to the complaints people have posted in this forum. Like you I am also unhappy with cox over this and am considering dropping them.

    As far as I can tell, the only solution is to not use a cox email account for group emails -- use gmail instead.

  • I am having the same problem but it is also happening when sending to only 1 person and without any attached documents.  Cox says the receiving email addresses have to send an email to and provide the address to unblock.  Cox says it's gmails fault as they've changed their servers but I think it's cox's fault.  I don't have this issue with any other server.

  • I am having the same issue with multiple gmail messages not making it through. I also have the same issue now from yahoo messages! The following came back from a friend that has email through yahoo servers. From: Date: December 1, 2016 at 2:29:27 AM PST To: xxxxxxxxxxxxxx Subject: Failure Notice Sorry, we were unable to deliver your message to the following address. : Mail server for "" unreachable for too long I really would appreciate COX addressing this.
  • Karen_R's avatar
    Former Moderator

    Hello tempusfugitintustin,

    Let us know if you're still encountering an issue with the emails that are being sent to email addresses. Thanks

  • ZHB99's avatar
    New Contributor

    Same problem here.  My kids homeschool and we are missing many homework emails from teachers.  Considering switching to Gmail accounts.  Been a Cox customer for nearly 20 years and this is unacceptable.  Was told the same thing from a Cox rep, that they were intentionally blocking gmail addresses at certain times because of high spamming.  They said that it was a temporary thing and that those emails sent to us should eventually come through but they never do.  one minute I can get an email from a gmail address and the next minute I can't.  

    Here is a forwarded email that the gmail sender received after an email they sent to me was returned to them:

    This is an automatically generated Delivery Status Notification



    Delivery to the following recipient has been delayed:

    Message will be retried for 1 more day(s)

    Technical details of temporary failure:
    Google tried to deliver your message, but it was rejected by the server for the recipient domain by [].

    The error that the other server returned was:
    452 4.1.0 Message threshold exceeded

  • DerrickW's avatar
    Valued Contributor

    I can take those headers from the Gmail sender and forward that information to our escalation team to find out why those messages are being rejected. Please email us with the account information and copy and paste the header and any other headers you may have into the email. Send to so we can investigate.
  • 22annika's avatar
    New Contributor

    Copied all technical information for dropped email should be received from gmail to COX email.

    So far nobody responded. This email coming from one person, not SPAM or advertisement.

    Gmail repeatedly sends or tries to send email, but getting blocked. Wondering what could have happened.

  • Hi Unhappy 100

    Thank you for this post.  It would seem that many email companies are starting to do things like this.  A bit too "Big Brother" for my tastes  We are not 5 years old, and we can decide, for ourselves what we do and do not wish to recieve.

    I am one of the organizations that you mentioned above - I teach music to children.  I have 25 music classes a week.   Suddenly, I am not able to send scheduling reminders, Classroom updates, Test study hints and other vital information to my students and their families who use email.  This is ridiculous.  I have sent all of my " students" a link to this thread and asked them to contact cox and complain.  

    Thank you again!

    Music Teacher