Hi,
End users of Jira are not able to raise incident in Jira through outlook email.
But if same end users are added in Jira Service desk group then they are able to raise incident in Jira by sending an email to xyz.com mail ID.
Although in Jira services desk I cannot add more than 50 users when I was testing which gives me error as "Adding a user to the selected groups will exceed the number of allowed users license in Jira service desk".
Jira service desk group is of support executives who resolves incident & there we cannot add users.
Thanks,
Rohit