I am building custom email templates but am experiencing problems with optimization across multiple devices/OS's/screen sizes etc. Is there any best practices for sizing or scaling that works across *most* if not all platforms?
Also, if you don't already use a service like Litmus or Email on Acid, definitely look into one. They will make checking your designs much, much easier.
For most recent-generation phones/tablets, they will compress everything down automatically, which is why the single column format is important. Some older phones it won't look great, but you're never going to make it perfect for everyone when it comes to HTML emails.
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