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Adds email headers to outgoing email. $headerName represents a header name and $headerValue - header value as string
$jirassimo.customEmailFrom($value)
Allows to provide dynamic value for email "From name". This can be a hardcoded constant or a value from $issue, like $issue.fields.assignee.displayName
$jirassimo.customEmailFromAddress($value)
Allows to provide dynamic value for email "From" address. This can be a hardcoded constant or a value from $issue, like $issue.fields.assignee.emailAddress