Few email encryption option in adobe campaign classic

Hi Team,

Is there any way we can encrypt only few emails in campaign classic and not all of them.

Requirement: Get an email from a webapp and post confirming the email address, we need to send an email which should be encrypted, but this encryption should not be applicable to all of the emails.

Is there a way to achieve this in campaign classic, any related references would also be helpful.

Thanks in advance!