Deliverability to cox.net
Cox.net is owned and operated by Atlanta, Georgia-based Cox Communications, which was founded in 1962. Cox services more than 6 million customers but announced in 2019 it would no longer offer new email accounts due to dwindling interest. Cox will continue to support existing email accounts.  

Emails Sent to cox.net: 3,912,469

Open Rate to cox.net: 348,895 (8.9%)

Date range:
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Sent vs Opens for cox.net

Date Sent Opens Open Rate
4/18/2021 1,949 39 0.0%
4/17/2021 2,373 137 0.0%
4/16/2021 4,928 157 0.0%
4/15/2021 4,228 211 0.0%
4/14/2021 3,565 118 0.0%
4/13/2021 3,336 164 0.0%
4/12/2021 2,972 144 0.0%
4/11/2021 2,450 150 0.0%
4/10/2021 2,296 116 0.0%
4/9/2021 2,609 216 0.0%
4/8/2021 3,382 157 0.0%
4/7/2021 4,211 277 0.0%
4/6/2021 2,527 127 0.0%
4/5/2021 2,444 202 0.0%
4/4/2021 1,637 94 0.0%
4/3/2021 1,447 108 0.0%
4/2/2021 2,268 172 0.0%
4/1/2021 2,958 201 0.0%
3/31/2021 3,459 210 0.0%
3/30/2021 3,401 279 0.0%
3/29/2021 3,104 195 0.0%
3/28/2021 1,869 135 0.0%
3/27/2021 2,754 147 0.0%
3/26/2021 2,867 119 0.0%
3/25/2021 2,245 93 0.0%
3/24/2021 3,613 206 0.0%
3/23/2021 2,917 163 0.0%
3/22/2021 2,895 139 0.0%
3/21/2021 2,040 105 0.0%
3/20/2021 1,691 113 0.0%

Blocks from cox.net

No blocks during specified time frame

Bounces from cox.net

Message Count
550 5.1.1 Recipient address rejected: User does not exist. 2,332
Invalid:550-MailboxUnavailable 556
552 5.2.2 Quota exceeded 48
Email was deferred due to the following reason: 16
452 4.1.0 server temporarily unavailable. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 14
554 cmsmtp 149.72.166.43 is listed on Cloudmark Please visit https://csi.cloudmark.com/en/reset?ip=149.72.166.43 4
421 cmsmtp too many sessions from 149.72.77.186. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 3
554 cmsmtp 149.72.232.105 is listed on Cloudmark Please visit https://csi.cloudmark.com/en/reset?ip=149.72.232.105 3
552 5.2.0 sender rejected. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 3
554 cmsmtp 149.72.181.178 is listed on Cloudmark Please visit https://csi.cloudmark.com/en/reset?ip=149.72.181.178 2
552 :: auth :: Message rejected for spam or virus content :: 2
SMTP; 550 5.1.1 Recipient address rejected: User does not exist. 2
554 cmsmtp 149.72.232.105 is listed on Cloudmark Please visit https://csi.cloudmark.com/en/reset?ip=149.72.232.105 2
554 cmsmtp 149.72.166.43 is listed on Cloudmark Please visit https://csi.cloudmark.com/en/reset?ip=149.72.166.43 2
554 cmsmtp 198.21.1.157 is listed on Cloudmark Please visit https://csi.cloudmark.com/en/reset?ip=198.21.1.157 2
550 5.7.1 Message blocked. If this is a false positive, please report this to your hosting service provider. See https://console.mailchannels.net/insights/bounce?auid=tih5qno0ow&sender=promotions.em%40workspin.net&txid=199750fe275abf26 1
551 SenderAuthorization: is not authorized to send emails to this service. 1
421 cmsmtp too many sessions from 50.31.63.79. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 1
421 cmsmtp too many sessions from 50.31.63.80. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 1
550 recipient rejected 1

Methodology

Send and open statistics are updated daily. Bounces and blocks are updated in real-time. Every day, open statistics are updated for the last 14 days. Generally, you'll notice an increase of an open rate for a domain for a day over the course of 14 days, since not all open events occur the same day an email is sent. That means that open rate data is tied to the actual emails sent on a particular day.

Bounce and block codes are the codes as returned by the remote SMTP server after having been de-personalized. Meaning, unique identifiers present in SMTP codes are removed so that SMTP responses can be grouped for analysis. In certain cases, such as when the email is being relayed through an intermediary SMTP server, the remote SMTP server may not be the same as the MX record for the domain. SMTP codes are categorized as "bounces" vs "blocks" by internal human review. Bounces generally indicate an invalid email address. Blocks generally indicate a rejection of the email message but a valid email address.