How to troubleshoot Comcast 0% open rates?
Summary
What email marketers say11Marketer opinions
Email marketer from StackOverflow recommends checking bounce messages for detailed error codes to understand why Comcast is blocking your emails. They also suggest implementing feedback loops to identify and remove problematic recipients.
Marketer from Email Geeks suggests that Comcast uses Cloudmark and the original poster should reach out to them.
Email marketer from Litmus emphasizes the importance of regular list cleaning to remove inactive subscribers and spam traps. They suggest using a reputable email validation service to identify and remove invalid addresses before sending.
Email marketer from SendGrid recommends gradually increasing sending volume while monitoring deliverability and reputation metrics. This allows you to build trust with ISPs like Comcast and avoid being flagged as a spammer.
Email marketer from HubSpot advises avoiding common spam trigger words in your email subject lines and body content. They provide a list of keywords to avoid and suggest using a spam checker tool to identify potential issues.
Marketer from Email Geeks mentions that Comcast also uses Vade Secure and suggests checking with them, providing a link to Comcast's postmaster page with instructions.
Email marketer from EmailGeek.net suggests checking Comcast's postmaster tools and ensuring your sending IP isn't on any blocklists. They also recommend segmenting your list and only sending to engaged users to improve your sender reputation.
Email marketer from Reddit suggests warming up your IP address slowly by gradually increasing the volume of emails sent to Comcast addresses. Also make sure that you're abiding by CAN-SPAM compliance.
Email marketer from Mailjet advises monitoring your sender reputation using tools like Google Postmaster Tools. They highlight the importance of maintaining a good reputation by sending high-quality content and avoiding spam traps.
Email marketer from GlockApps recommends using email testing tools to preview how your emails will appear in different inboxes, including Comcast. These tools can help identify and fix rendering issues or spam trigger words before sending.
Email marketer from an email marketing forum suggests closely monitoring bounce rates and unsubscribes. A high bounce rate indicates issues with your email list, while a high unsubscribe rate may suggest problems with your content or sending frequency.
What the experts say3Expert opinions
Expert from Word to the Wise, Laura Atkins, responds that authentication (SPF, DKIM, DMARC) is a must, as is actively managing your reputation. Comcast is more likely to block senders with poor sending practices.
Expert from Email Geeks shares that you can also mail postmaster@proofpoint and ask for assistance.
Expert from Spam Resource responds that one should ensure the email content is not perceived as spam. They suggest checking the content against spam filters and making adjustments as necessary.
What the documentation says5Technical articles
Documentation from Comcast Support suggests reviewing Comcast's email policies and guidelines. They recommend ensuring proper authentication (SPF, DKIM, DMARC) is set up correctly and checking for any violations of their sending policies.
Documentation from RFC explains that SPF (Sender Policy Framework) is an email authentication method designed to prevent spammers from sending messages on behalf of your domain. It allows you to specify which mail servers are authorized to send email from your domain.
Documentation from RFC explains that DKIM (DomainKeys Identified Mail) is an email authentication method that uses digital signatures to verify the sender and ensure the message has not been altered during transit. Implementing DKIM can significantly improve email deliverability.
Documentation from Spamhaus explains that if your IP is blocklisted, you should investigate the cause, fix any security issues, and then follow their delisting process. This typically involves filling out a form with details about the issue and steps taken to resolve it.
Documentation from Vade Secure states that to request removal from their blocklist, you or your email provider can visit their website. They also mention ensuring that your email practices comply with industry standards and best practices.