What are common email delivery issues with Cox and solutions?

Email marketer from Email Geeks notes that the move to Yahoo already occurred as of March 5th and they had to fix their seeds.

Email marketer from Email Geeks shares his experience with Cox email problems, mentioning a small percentage (1%) of their list experiences issues. He stops emailing those addresses and considers retrying when they move to Yahoo.

Email marketer from Email Geeks shares a solution for a bounce issue they had with Cox, which was a result of "ptr_domain_age". They contacted Cox, pointed out that the domain was in use since August 2023, and Cox made changes to resolve the issue.

Email marketer from DSLReports Forums notes that dynamic IP addresses assigned by Cox can lead to email delivery problems. They advise using a reputable email service provider (ESP) or setting up a static IP address (if available) for the email server.

Email marketer from Mailtrap Blog explains that Cox might block certain ports, such as port 25, which is used for SMTP. Suggests using alternative ports like 587 or 465 for secure email transmission.

Email marketer from EmailDeliverability.com shares that sending emails to outdated or invalid email addresses can hurt your sender reputation with Cox. Recommends regularly cleaning your email list to remove inactive or invalid addresses.

Email marketer from StackOverflow shares that a missing or incorrect reverse DNS (rDNS) record can lead to email delivery issues. Explains that rDNS helps verify the IP address of the sending server and ensures it matches the domain name.

Email marketer from MXToolbox explains that being listed on email blacklists can prevent emails from being delivered. Suggests using MXToolbox to check your domain against various blacklists and take steps to get delisted if necessary.

Email marketer from Reddit reports that Cox's aggressive spam filtering can block legitimate emails. They recommend contacting Cox support to whitelist specific domains or email addresses.

Email marketer from Cox Support Forums suggests that common issues include email being marked as spam due to sender reputation. The solution offered is to ensure proper SPF and DKIM records are set up, and to avoid sending unsolicited emails.

Expert from Word to the Wise responds to the question by detailing ISPs often block email due to IP reputation, domain reputation, content, and spam traps. The solutions include monitoring and improving sender reputation, authenticating email, and ensuring compliance with email best practices.

Expert from Email Geeks discusses the unique ptr_domain_age bounce issue Brian Sisolak encountered with Cox, and thanks Brian for sharing this information.

Expert from Spam Resource explains that one issue is residential IP address blocks being used to send email, noting that some ISPs like Cox may have blocks listed for spam and that sender reputation can get associated with IP addresses or blocks allocated to dial-up or DSL users.

Expert from Word to the Wise explains the importance of using feedback loops, which ISPs provide, to identify and remove subscribers who mark emails as spam. He notes that failing to process FBLs can negatively impact your sender reputation and delivery rates.

Expert from Email Geeks confirms Cox is moving to Yahoo and provides a link to a Spam Resource article about it.

Documentation from Spamhaus explains that a poor sender reputation due to spam complaints or blacklisting can cause delivery issues. The recommendation is to monitor your sender reputation and take steps to improve it, such as cleaning your email list and ensuring compliance with email marketing best practices.

Documentation from Cox Business Support details guidelines for sending bulk emails. They state that adhering to CAN-SPAM compliance, and maintaining appropriate sending volumes is important to avoid being flagged as spam.

Documentation from Cox provides information about using the correct outgoing mail server settings (SMTP) which include the server address, port, and encryption type. This helps in properly configuring your email client to send emails through Cox's servers.

Documentation from RFC details that an incorrectly configured SPF (Sender Policy Framework) record can cause emails to be rejected by receiving mail servers. The recommendation is to ensure that your SPF record accurately lists all authorized sending sources for your domain.

Documentation from DKIM.org details that lacking a properly configured DKIM (DomainKeys Identified Mail) signature can cause emails to be flagged as spam. Emphasizes the importance of implementing DKIM to authenticate your emails and prove they haven't been tampered with.