To diagnose slow email delivery, consider the following steps:
Check Server Logs: Review email server logs to identify any bottlenecks or delays in the delivery process. Monitor Delivery Rates: Use your email service provider's analytics tools to monitor delivery rates and identify patterns of delay. Test Emails: Send test emails to different email accounts to see if the delay is consistent across different providers. Consult Support: Reach out to your email service provider's support team for assistance in diagnosing the issue.