You can add arbitrary header lines to outgoing emails.
To set up the Custom Header plugin:
Select
Enable
Click the
You can add, edit, or remove the header fields. For every header field you add, you can specify the keys and values. The key is used as the title of the Custom Header. You can enter multiple values for the keys. You must use a semicolon to separate every value you enter.
Click
Select
In the
Set the values for the header fields by using the dropdown list.
Click