I want to setup service desk so that clients can communicate through email. Is that possible?
I was expecting to be able to setup email for a project in the project settings but I don't have a link to link email accounts. Was following this help page: https://confluence.atlassian.com/display/SERVICEDESK/Receiving+requests+by+email
Yes, it is possible.
The documentation you are referencing is actually for Server version.
I suggest you to follow the Cloud specific documentation, since it may have some differences in the setup:
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