Yes it is. You can either change this globally or on a per-email basis
Global
In the SETTINGS admin console you can select the Email Settings section, this has an option to deselect the Confirmation emails being sent.
When this is un-ticked the system will NOT send you a confirmation of the email that has been sent from the system in the datacentre.
Individual Email
You can also untick the "Send Confirmation" on an individual email
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