Resending Outgoing Messages
When Communications Outbound Manager fails to send an outgoing message, the Status field of the outgoing message changes to Canceled. You can resend these canceled messages.
To resend an outgoing message
Navigate to the Communications screen, then the Communications List view.
Select Canceled Items in the Saved Queries field of the toolbar.
In the list of email messages, select the outgoing message that you want to resend.
Click Re-Send.