spaces not tabs
removed a rogue line break
added responsive breakpoint
responsive email shell
more efficient media query
Added viewport meta tag.
Spacing of tabs.
Removed mc:edit attributes.
unicode encoded copyright symbol
Explicitly state 'text-align: left'

The '<center>' element wrapped around things causes all text to be centered in certain versions of Outlook.
Wrapped '*|EMAIL|*' in an '<a>' with a style specifying color.

Gmail and Outlook otherwise style the email address the way they want to.
changing how styles get written and placed
added a description
clarified the inlining process
explicitly styled unsubscribe link
fixed some inconsistencies in table naming, responsive review
removed a redundency; outlook corrections