There is not an option for this. Users need to have an account to open issues. They can be automatically added as @Alex Christensen indicates. If they only ever use email for opening/commenting on issues then not login required but if they use the portal then they need to login.
The Jira Service Desk marketing team is working on a guide to help new Atlassian customers switch from email to JSD and we'd love to hear from you! Please share: - What made you realize that i...
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