How to set 'email header' in ojs

how to set ‘email header’ in ojs.please tell me.

The “email header” could refer to a number of things.

OJS can use a textual prefix for sent email. This is configured in Journal Setup, Step 1.4 “Email Identification”.

OJS can also manipulate certain SMTP headers, if SMTP is used. This is configured in config.inc.php: