If you can't find the mail settings, it is probably due to the fact that you don't have "Jira system administrators" permission.
In System administration, Security, Global permissions you are able to define some permissions, if you have enough access to see it offcourse. You need to have this specific permission before you are able to see/update the mail settings.
EDIT: Nevermind, i just noticed the cloud tag. I was thinking of Server and Datacenter.
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