Variable values for email's custom headers

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Your software
My Mautic version is: v4.4.1
My PHP version is: 8.0.25
My Database type and version is: 10.6.11-MariaDB-0ubuntu0.22.04.1

Your problem
My problem is:
is it possible to set variable custom email headers for the email templates ?
I would like to set the ID as a custom header for the email for bounce handling for each created email template

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While I have no answer, I would like to see if there is one, as this could solve a problem I encountered.

Thanks for asking the question.

Kudos and best regards,
Sven

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when creating a new e-mail, you can add custom headers in the advanced tab.

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but I don’t think you can create custom headers in the theme.