How add a tag in #defaultMailHeader in velocity

[aas]

Hello everybody. I need to make custom email template and don't know how to add <a> tag into  #defaultMailHeader

#set($greeting = "#authorlinkkey($issue.reporterId $linkstyle) has closed issue in <a href="https//:url">JIRA</a>")
#defaultMailHeader($greeting)

And I have error : Encountered "https"

but it works fine without tag:

#set($greeting = "#authorlinkkey($issue.reporterId $linkstyle) has closed issue in JIRA ")
#defaultMailHeader($greeting)

Glad to any help.

[Boris Berenberg - Atlas Authority]

You can do this as part of the template editor in https://marketplace.atlassian.com/apps/1211069/notification-assistant-for-jira-email?hosting=server&tab=overview