Though, I have another suggestion.
In our setup we have disabled the standard notifications sent out by JSD. Instead we are using JIRA Enterprise Mail Handler (https://marketplace.atlassian.com/plugins/com.javahollic.jira.jemh-ui/versions#b100702500).
You can then have full freedom to customize all content of the email sent out to you customers; add logo, include custom fields etc.
Hello Atlassian Community! I'm Teresa, the Product Marketing Manager for Jira Service Desk Server at Atlassian. I'm excited to announce two exciting releases for Jira Service De...
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