Provided you have your email integrated within karma, and are on a Pro plan or higher, you can send an email to a single contact several different ways. 

Anywhere you see a contact's email address (dashboard, list, or inside a contact), you can click the email address and apply an email template or type out your email and click send.

You can also go inside a contact, scroll down to where you see the add a note box, and select send an email. In the email box, you can email template or type out your email and click send.

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