I am using CRM 2016, and trying to customize email template by adding a dynamic data. I know that CRM allows to use only specific vanilla entities, but when I explorer an old code I found an option to use {0}, {1} etc' for injecting data from non vanilla entities (by code) - unfortunately that code cannot be tested... Have someone heard or know about that way? is it possible? what to google for?
You can do this by manually typing similar marker what CRM is using. Note that this is not documented in SDK.
Dynamic Values For Custom Entities In Email Templates
In the template, where you want the value to appear, type within 2 brackets an exclamation point followed by the entity logical name. After the entity name, add a colon, and then the field logical name, ending it with a semi colon. If you’d like a default value if nothing was found, after the semi colon add the default value.
{!<entitylogicalname>: <fieldlogicalname>; <Default Text>}
More in part 2:
The Global Template Type is what you’d want to use for custom entities, or any other entity not listed in the template type drop down menu. And just to reiterate, regardless of the way you insert values, whether you use the out of the box insert method or you manually type it in, you can only insert values from one record.
Dynamics' email templates are flawed. You either can't use custom entities or you have no translation. I use this workflow instead. It can do everything : https://github.com/rtebar/dynamics-custom-emails
来源：https://stackoverflow.com/questions/47649621/how-to-customize-email-template-in-crm-2016-by-code