To resolve email delivery issues with Cox, Optimum, and Charter/Spectrum, a multifaceted approach is needed. Key elements include implementing strong email authentication (SPF, DKIM, DMARC) and ensuring SPF records accurately reflect sending sources. Maintaining excellent list hygiene by regularly cleaning lists and avoiding spam traps is crucial. Proactive sender reputation management, including monitoring Sender Score and using Google Postmaster Tools, is essential. Gradual IP warming is recommended for new IPs. Ensuring a correct reverse DNS (PTR) record is also critical. Regular email testing for content and rendering issues can prevent spam filter triggers. List segmentation based on engagement enhances deliverability. Avoiding spam trigger words and excessive formatting is important. Seeded testing and feedback loop (FBL) monitoring provide valuable insights. Specifically, note that Cox uses Cloudmark, their filtering is dynamic, and contacting their support through the Cloudmark form can be beneficial. Additionally, staying within Outlook.com sending limits and monitoring blocklists like Spamhaus are essential.
10 marketer opinions
To resolve email delivery issues with Cox, Optimum, and Charter/Spectrum, it's essential to focus on several key areas. These include authenticating your emails using SPF, DKIM, and DMARC; maintaining a clean email list by removing invalid addresses and managing spam complaints; building and monitoring your sender reputation; warming up new IPs gradually; ensuring you have a reverse DNS record; testing your emails for content and rendering issues; segmenting your email list based on engagement; and avoiding spam trigger words and excessive formatting in your email content. For Cox specifically, understand their dynamic filtering policies and use the Cloudmark support form to report issues. Monitoring Sender Score is crucial. Also, consider that Cox assesses reputation dynamically using various metrics.
Marketer view
Marketer from Email Geeks clarifies that at Cox, it's not necessarily IPs being blocked, but reputation being assessed across different metrics. They advise reducing sending volume/IPs if hitting limits and offer to investigate with provided IPs and rejection messages.
16 Oct 2022 - Email Geeks
Marketer view
Marketer from Email Geeks explains that Cox's filtering is a dynamic set of rules/policies where an IP can change state during an SMTP transaction. Suggests submitting issues via the Cloudmark support form, including rejection messages, timestamps, sending IPs, and destination network/domain.
14 Aug 2024 - Email Geeks
3 expert opinions
To resolve email delivery issues with Cox, Optimum, and Charter/Spectrum, experts recommend using seeded testing to monitor deliverability across various ISPs to identify placement issues and authentication problems. Maintaining clean email lists to avoid spam traps is also essential. Furthermore, setting up and monitoring feedback loops (FBLs) from ISPs is crucial for identifying and addressing deliverability issues, providing valuable data on complaints and abuse reports to improve sender reputation.
Expert view
Expert from Word to the Wise, Dennis Dayman, answers that setting up and monitoring feedback loops (FBLs) from ISPs is crucial for identifying and addressing deliverability issues. FBLs provide valuable data on complaints and abuse reports, allowing senders to quickly remove problematic subscribers and improve their sending reputation with ISPs like Cox.
9 Jul 2021 - Word to the Wise
Expert view
Expert from Spam Resource, Steve Jones, emphasizes the importance of maintaining clean email lists to avoid hitting spam traps. Regularly cleaning your list to remove invalid or inactive addresses helps ensure that you are only sending to engaged recipients, reducing the likelihood of being flagged as spam by ISPs like Cox.
3 Apr 2023 - Spam Resource
5 technical articles
To resolve email delivery issues with Cox, Optimum, and Charter/Spectrum (and other ISPs), it's critical to authenticate your email using SPF, DKIM, and DMARC. Ensure your SPF records accurately list authorized sending sources. Implement DMARC to protect against email spoofing. Monitor sender reputation using tools like Google Postmaster Tools. Adhere to email sending best practices, including list management and sending frequency. Stay within sending limits for services like Outlook.com. Regularly check and address any listings on blocklists like Spamhaus.
Technical article
Documentation from Spamhaus details how to check if your IP address is on their blocklist and what steps to take to delist if you have been listed. Monitoring and quickly addressing any listing on Spamhaus can prevent deliverability problems.
4 Jul 2023 - Spamhaus
Technical article
Documentation from Google advises bulk senders to authenticate their email with SPF, DKIM, and DMARC. It also suggests monitoring sender reputation via Google Postmaster Tools and following best practices for list management and sending frequency to avoid delivery issues with ISPs.
13 Sep 2022 - Google