What should be a html/email template’s line-height, font-size, letter-spacing, word-spacing size?
Hello how are you doing!
There is no exact measurement of space sizes or heights.
What should be the size? That will depend on the type of letter you select and also on the concept you carry out.
Maybe it helps you a little to see how other templates in your segment use their sources, but try to look for the recently approved ones, do not try to look at old projects.
You have a good day
Cheers