How to resolve temporary deferred messages from Yahoo and other email deliverability issues?
Summary
What email marketers say13Marketer opinions
Email marketer from GlockApps explains that using a reliable email testing tool to check your email's placement in different inboxes (Gmail, Yahoo, etc.) can help identify deliverability issues before sending to your entire list.
Email marketer from SparkPost shares that carefully segmenting your email lists and sending targeted content can improve engagement and deliverability. Avoid sending generic emails to your entire list.
Email marketer from StackOverflow suggests implementing proper retry mechanisms in your email sending infrastructure. If you receive a temporary deferral, retry sending the email after a short delay, as the issue might be transient.
Email marketer from Mailjet explains that using dedicated IPs can help improve deliverability by isolating your sending reputation from others. Also, using a double opt-in process will make sure your recipient actually wants the email.
Email marketer from Litmus recommends monitoring engagement metrics like open rates and click-through rates. Low engagement can negatively impact your sender reputation and lead to deliverability problems.
Marketer from Email Geeks suggests to generally ignore UCEPROTECT.
Email marketer from SendGrid shares that monitoring your sender reputation and promptly addressing any deliverability issues are vital. Use feedback loops and monitor bounce rates to identify and fix problems.
Marketer from Email Geeks suggests following the advice from the Yahoo postmaster team and the information in the provided link.
Email marketer from Email on Acid emphasizes the importance of previewing emails across different email clients and devices to ensure a consistent and positive user experience. Poorly formatted emails can lead to spam complaints.
Marketer from Email Geeks recommends configuring the MTA to temporarily suspend traffic when receiving a TSS04 error from Yahoo, in addition to slow sending, and to read the instructions at the provided link.
Email marketer from Reddit recommends checking your IP and domain reputation against various blocklists. If you find yourself listed, follow the blocklist's removal process to get delisted.
Email marketer from Neil Patel explains that maintaining a clean email list, segmenting your audience, and warming up your IP address are crucial for avoiding deliverability issues. Regularly clean your list of inactive subscribers to improve your sender reputation.
Marketer from Email Geeks suggests that the Yahoo deferred mail issue indicates the need for warming up the IP address.
What the experts say2Expert opinions
Expert from Word to the Wise explains that you should ensure the message is valid (syntax is correct, it complies with standards, the sender is who they claim to be). Also that the server is configured properly (correct DNS, reverse DNS records).
Expert from SpamResource explains to ensure you are implementing SPF, DKIM, and DMARC correctly. Without these, your messages are more likely to be deferred, blocked or sent to the junk folder.
What the documentation says5Technical articles
Documentation from AWS SES recommends monitoring bounce and complaint rates. High rates can lead to deliverability issues. Take immediate action to address the root causes of these issues.
Documentation from Google states that deferred emails can be caused by reputation issues and/or lack of authentication. To resolve it, ensure SPF, DKIM, and DMARC are properly set up. Improve your sender reputation by sending wanted emails and avoid spam complaints.
Documentation from Yahoo Help explains that temporary deferrals (4xx errors) indicate a temporary condition preventing message delivery. The reasons can include greylisting, temporary network issues, or the recipient's mailbox being temporarily unavailable. Resolving the issue usually involves retrying the delivery later.
Documentation from RFC 5321 (SMTP standard) explains that 4xx SMTP error codes indicate temporary failures. The server expects the client to retry sending the message later.
Documentation from Microsoft Learn explains that temporary deferrals can occur due to greylisting or throttling. Ensure your sending server is properly configured and follows best practices for email sending, including proper authentication.