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This PR attempts to improve Cerberus's rendering in Gmail after it's forwarded. #264 and #262 both report issues with the templates' rendering when forwarded. @maxackerman pointed out this nifty trick by Lee Munroe that prevents ESPs from inlining certain CSS properties, which seems to be the cause of the email breakage when forwarding.
I haven't fully tested this in Gmail, but adding it doesn't seem to cause any regression.
@maxackerman @marcelgruber would you be willing to help test this?