Hi i’ve recently start doing some research on EDM.

Different platform ( Desktop App , Mobile App, Web Mail ) for different product (Gmail , Yahoo , AOL….) will have different can & can’t do things.

To have a clearer view of what i meant , you can check out this link https://www.campaignmonitor.com/css/

Since most of us are using gmail, i will share another link talking about what are the things that you MUST KNOW for creating EDM for gmail .