How do I get mail delivery logs for a subscriber?
If a subscriber complains about not receiving your messages, look at the "Troubleshoot Subscriber Email Address" section and use the "Subscriber History" option first to make sure they are on your list.
Log into your mail-list account, and click on the Troubleshoot Delivery Problems button.
Enter the email address of the subscriber that is not receiving your messages, and click on the Search Logs button
The results are shown, messages that were successfully delivered are highlighted in green and messages highlighted in red failed upon delivery.
If all the messages are GREEN, their ISP is receiving the mailing list messages, but we do not know what happens after that.
Copy and paste the bottom most green message, and ask your subscriber to file a support ticket with their ISP to discover the problem.