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BigDog7

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Cox has marked my email server as a spammer - how to resolve?

I am using Siteground Hosting for my business websites and email addresses.  Cox has recently marked my email server's IP address as spam.  At least I am getting non deliverable notices from Cox.  I have tried from 2 separate email addresses and both have the same failure notices.  Here is a copy of the message with personal info redacted:

From: Mailer-Daemon@se19.mailspamprotection.com

Reporting-MTA: dns; se19.mailspamprotection.com

Action: failed
Final-Recipient: rfc822;qqqqq.qqqqqq@cox.net
Status: 5.0.0
Remote-MTA: dns; cxr.mx.a.cloudfilter.net
Diagnostic-Code: smtp; 421 cxr-ibgw-5007a.stratus.cloudmark.com cmsmtp 146.66.121.163 blocked. Refer to Error Codes section at www.cox.com/.../email-error-codes.html for more information. AUP#CXCNCT: retry timeout exceeded

The email server ip address that is being blocked is 146.66.121.163 and does not show up on any spam blacklists that I can see.

I can give you the email addresses if you need them, but do not want to post them to a public forum.

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PC_Medic

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11 Messages

Have the same issue at my employer where I am the I.T. Coordinator. This (421 #CXCNCT) error is not due to a 'blacklist' block, but due to too many concurrent connections being attempted. Cox tells me it is a Siteground configuration issue and Siteground says it is a Cox issue.

Now at first I was thinking it may have been caused by staff sending out 'group' emails even though they were adhering to the <40 recipients in a group rule. However I have tested myself by trying to send a single email from my work accounts ( I have 3) to my home @cox.net account and get the error about 80% of the time. The annoying part is it sometimes takes 2 to 3 days to get the bounce back message from Cox.

Too make things even more interesting, in many cases I (and others) actually receive the emails that Cox's server is saying failed to be delivered.

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PC_Medic

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11 Messages

By the way here is link to some good reference on their error codes

Email Error Codes

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BigDog7

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Thanks for the info.  Cox is the only ISP that is complaining.  My wife does send some group emails, but never more than 15 recipients.  We can send emails to many other domains without the issue.  It should be simple for Cox to review the emails from our server and if they don't see anything nefarious then whitelist the server.

You mentioned a 40 recipient rule - does Cox have a page detailing this and other requirements in enough detail that I can send to Siteground support?  It would be best to have a tech from each company talk directly.

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chiefkibitzer

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OMG. I have been dealing with EXACT nightmare for a month and half and still no resolution. Siteground blames Cox and vice versa. Siteground claims they are requesting to be delisted from Cox and Cox won't respond. When I call Cox they just escalate the support to a higher tier and promise a call back which never happens. I am beyond frustrated. Cox is a local company and all the email addresses on my server (dozen domains) correspond with people who use Cox cause they're local. And of course now all the Siteground emails are being blocked or delayed by Cox. Occasionally 1 or 2 will go through but even that's rare. PLEASE, if anyone gets a resolution to this please post. 

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CrystalS

Former Moderator

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440 Messages

Hello.
The purpose of the Cox Internet Forum is to allow customers to discuss technical topics related to residential Cox Cable, Telephone, and High-Speed Internet services with other customers. This appears as if you may need someone to look into your account personally. We would definitely be able to assist you with this. Please reach us on Twitter at @CoxHelp, visit us on Facebook, or email us at cox.help@cox.com. Provide us the name on the account with the complete service address with a link to this thread so we can get started.

Crystal S. Cox Support Forum Moderator

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chiefkibitzer

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With all due respect Crystal, this IS a big issue with Cox that affects other accounts in addition to mine. When 2 large companies like Cox and Siteground are having issues that can't be resolved then I believe a forum is EXACTLY where I want to turn to for answers.  I was simply doing a google search for this issue and found this forum. I responded to it so that maybe I can get some answers. I have been working with Cox diligently for almost 2 months now (an hour again on chat with them yesterday) and I have gotten nowhere. I have unresolved tickets with Cox so there is no need to reach out to them again. I am desperate for a resolution so please try to be understanding of my situation. If there is a chance that someone else out there has had this same exact issue and was able to resolve it then I would welcome the information. 

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ChrisL

Former Moderator

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7.1K Messages

Technical assistance isn't available for external parties trying to send email to cox.net addresses. To resolve the error message you're receiving you'll need to contact the technical support for your mail server so they can make the necessary adjustments. Once the remote server is compliant with our email guidelines the error should stop.

-Chris

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