If there are multiple users attached to the same e-mail address, will JIRA send mulitple email notifications if changes have been made to a log in which they are all attached (i.e. a reporter, watcher, assignee)?
Yes. It aggregates users, but not email addresses.
That is, if you have a scheme which sends mail to reporter, watcher and assignee, and one of your users matches all three of those, Jira will only send them one email.
But if you have three users, Alice, Bob and Charlie, and you've set all of their emails to abc@yourcompany.co.uk, and they're all watchers on the issue, then three emails will be sent - one to each user, even though the email addresses are the same.
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