A program is trying to send an e-mail message on your behalf

We’re using an application which can send notification messages to our customers. It does this via Outlook but for each email that we send out we get the warning below:

A program is trying to send an e-mail message on your behalf. If this is unexpected, click Deny and verify your antivirus software is up-to-date.

We then have to wait a few seconds before a progress bar is to 100% before we can click on Allow.

Needless to say, this is very annoying and quite a time suck as it does this for every email.

Is there a way to suppress these security alerts even if it is just for this application?