Delay in Mail Delivery

Exchange will attempt to deliver all mails immediately. However there may be instances where delivery is delayed due to various reasons. One example is when the remote receiving email server is not available.

The following depicts how Exchange will behave for delayed mails:

1. The mail delivery will be retried every 15 mins.
2. You will get a notification regarding the delay after the mail has not been delivered for the first 6 hours as well as every subsequent 6 hours. Note that this is only for notification and there is no action required from you as the user.
3. If the delivery is still unsuccessful after 24 hours, the delivery will be deemed as failed and the mail will be returned to the user.