This question is in reference to Atlassian Documentation: Get your customers started with JIRA Service Desk
Does the requestor in JIRA ServiceDesk (request created via email) needs to be a JIRA user first?
Depends on what you mean by "requestor" - see https://confluence.atlassian.com/servicedesk025/setting-up-service-desk-users-754977391.html for the different types of user that you might be describing.
But, generally, yes, they need an account. Whether it's a JIRA user account is debatable ("JIRA user" is the phrase usually used for a full JIRA account, not just a simple customer account)
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