To add a new header and footer in email templates, it’s not necessary to create a new module. You can use Transactional Emails. Navigate to System -> Transactional emails.
Then create a new Header template for all emails.
Now to use this template, navigate to Configuration -> Design -> Transactional Emails and select a new template for Email Header Template.
Then we do the same for Footer templates.
Pretty simple, right?
If you have a multistore, it’s possible to set a separate template for each store.
To learn more about Magento Emails read the article “Newsletters in Magento 2.0“.
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