Use my own email templates

Hi there, did a quick search on here and these results came back as relevant results that may help you out:
https://community.telligent.com/community/11/w/developer-training/65124/template-based-email
https://community.telligent.com/community/11/w/user-documentation/62979/how-do-i-customize-email-sent-from-the-community
https://community.telligent.com/community/11/w/developer-training/65087/using-velocity
https://community.telligent.com/community/10/f/ask-the-community/1146097/send-an-email-using-velocity-script (for v10 but may still be applicable for you)

Thanks!

You can change the master wrapper for all emails.  As far as sending using a "template"  all emails sent from telligent will have the master wrapper.  If you have a specific template you want to use, we're probably looking at some sort of custom ITemplatable Plugin