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James BuckelewJames Buckelew 

Looking to update to My Domain while switching to lightning, questions after testing

There are few things I'm looking to accomplish in lightning that require lightning components, but we never set up our domain. I'm attempting to test in sandbox, but running into an error with out email templates. 

Currently the things i'm aware of with hard coded URLS:
- Custom buttons/links related to email templates
       If there is a way to create new buttoms for email template links I'm all ears current part of our link in the custom email button/link ---- (instance).salesforce.com/_ui/core/email/author/EmailAuthor?rtype....template.ID=dddddddddddd
I tried updating this link to the new domain, but it didn't work. I got an error saying we weren't in compliance with salesforce email 

- Visualforce pages 
- A few APIs 
- one or two misc things

I would like to be able to build out some new components but I am worried that switching to my domain will break too many things for me to fix. Any guidance or suggestions would be greatly appreciated. Thank you for reading all this!!