How to add custom headers in mail ?

get-help
1

I need to add the header ‘X-Server-Id’ to emails, and the header value should always be ‘1000’. Is this possible? Please share the steps to configure this.

2

Hey there @kindhearted-deer, thanks for posting. To ensure the fastest resolution to your issue, please review the following and follow all the steps:

3

These may be helpful: