How to edit Email header

[kadoi_sakiko]

I wanna to add the following code to Email header.

・List-Unsubscribe-Post: List-Unsubscribe=One-Click

・List-Unsubscribe: <https://solarmora.com/unsubscribe/example>

But I can't find the Email header editor other than sending email address and title, etc.

Please tell me how to edit.

[SanfordWhiteman · Accepted solution]

You can't edit the SMTP headers. Marketo already takes care of those List-Unsubscribe headers for you.