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: 3,631,789

Open Rate to cox.net: 331,048 (9.1%)

Date range:
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Sent vs Opens for cox.net

Date Sent Opens Open Rate
1/26/2021 3,398 91 0.0%
1/25/2021 3,963 140 0.0%
1/24/2021 1,855 71 0.0%
1/23/2021 3,136 243 0.0%
1/22/2021 3,900 242 0.0%
1/21/2021 3,067 284 0.0%
1/20/2021 2,902 179 0.0%
1/19/2021 2,825 129 0.0%
1/18/2021 3,306 139 0.0%
1/17/2021 2,641 163 0.0%
1/16/2021 2,611 94 0.0%
1/15/2021 3,540 226 0.0%
1/14/2021 3,020 167 0.0%
1/13/2021 3,457 195 0.0%
1/12/2021 2,809 176 0.0%
1/11/2021 3,081 171 0.0%
1/10/2021 1,919 178 0.0%
1/9/2021 2,477 193 0.0%
1/8/2021 3,153 322 0.0%
1/7/2021 3,480 298 0.0%
1/6/2021 2,695 280 0.0%
1/5/2021 3,864 351 0.0%
1/4/2021 2,342 139 0.0%
1/3/2021 1,135 72 0.0%
1/2/2021 1,305 85 0.0%
1/1/2021 2,185 80 0.0%
12/31/2020 2,319 104 0.0%
12/30/2020 4,150 178 0.0%
12/29/2020 1,991 136 0.0%
12/28/2020 1,887 158 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. 2,719
Invalid:550-MailboxUnavailable 2,707
452 4.1.0 server temporarily unavailable. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 70
552 5.2.2 Quota exceeded 70
421 cmsmtp too many sessions from 149.72.166.225. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 15
552 5.2.0 sender rejected. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 10
535 Incorrect authentication data 5
No IPs are available for this account 5
421 cmsmtp too many sessions from 149.72.166.43. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 4
421 cmsmtp too many sessions from 198.21.1.157. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 4
Email was deferred due to the following reason: 3
421 recipient rejected. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 2
421 cmsmtp too many sessions from 198.21.1.176. Refer to Error Codes section at https://www.cox.com/residential/support/email-error-codes.html 2
554 5.4.14 Hop count exceeded - possible mail loop ATTR34 1
SMTP; 550 5.1.1 Recipient address rejected: User does not exist. 1
334 334 535 5.7.3 Authentication unsuccessful 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.