When you send messages from iService, either through the user interface or a batch utility, messages are built and stored in a table awaiting delivery to your SMTP server. These messages are typically delivered within a few seconds, but if there is a problem with delivery you can view the pending message from the Admin Tools – SMTP out tab.
As shown below, messages with errors are displayed on this page with an option to modify the next delivery attempt.
If there is a known problem with your SMTP server, you can delay the next delivery attempt by one hour or one day.
In some cases the message will never be delivered because of a problem with the email address. In those cases you should select Remove Permanently to clear it from the SMPT Out queue.
You can apply these actions to multiple messages by selecting their checkbox.