When emails fail to reach their destination due to temporary errors on the recipient server, they aren't immediately bounced back to the sender. Instead, they are queued for automatic retry, giving the delivery another chance to succeed without any action needed from the sender.
The sender receives a notification after 4 hours with the reason for the delay:
"Message sending has temporarily failed and will be tried for another 4 days. Message will permanently fail if all attempts are unsuccessful."
Monitor delivery failures in one place: View all queued emails along with the sender, recipient, last retry time, reason for delay, and full header information.
Validate email headers: Inspect header details to diagnose delivery issues and identify patterns.
Manually trigger retries: Select specific emails and use the Retry option to attempt delivery immediately, without waiting for the next scheduled retry.
Manage domain-specific delivery issues: When emails to a valid domain are delayed due to a temporary issue on the recipient server, admins can select all affected emails for that domain and retry them at once. This helps in preventing unnecessary bounces to senders.
Remove emails from the queue: Clear specific emails from the retry queue when retrying is no longer required.
Steps to perform Retry Emails from Zoho Mail Admin Console
Log in to Zoho Mail Admin Console.
Go to the Mail Settings menu, and select Retry Emails.
All the emails that are awaiting retry will be listed here, along with the recipient address, last retry time, pending retries, and the reason for failure.
Click on any email in the listing to view the email's headers.
Select the emails in the retry queue on which you'd like to perform an action.
You can choose to either Send or Delete the emails.