نقص في تخصيص البريد الإلكتروني الأساسي

[Lilly (Lillian Louis)]

Have you see this? Not sure if it would work for your case, but might be worth a try

How to make customized emails better looking

You can use something like https://beefree.io/templates/ to create a beautiful email template and then copy the html code into email style, that runs with standard email html.