Yes, during a mail server outage, you can redirect your messages to an external email address (such as a Gmail address). Then, after your mail server is back online you can revert back to your normal configuration and use the Bulk redeliver
feature to re-send all of the messages that failed to deliver during the time that your mail server was offline.
Redirecting your mail to an external email address
- In the control panel, go to Settings > Delivery Mail Host
- Record your current Mail host so that you can switch back to it later.
- Change the Mail host to the external Email address you want to deliver the mail to and save your changes.
Bulk re-deliver messages to your mail server
After your mail server is back online, you can re-deliver the messages that were routed to your mail server by using the Bulk re-deliver tool.
- From the control panel, go to Settings > Delivery Mail Host
- Change your Mail Host back to what it was before, click the Update mail host button
- Wait a few minutes to confirm that messages are delivering to your mail server.
- Go to the Quarantine+ > Clean mail area.
- Click on the Advanced search link to enter a Start date + End date range (based on the timeframe that your servers was offline).
- Click on the Bulk redeliver button.
The bulk-redeliver process can sometimes take a while. To check the progress, go to Tools > Bulk Redliver Status