Welcome to the Atlassian Community!
There are two things that might be happening here.
1) You are a user of that Jira system, and it has been configured to tell you things.
2) It's a malicious site. Atlassian's anti-moron systems are not great, and let far too many bad people can create accounts which then can create free Jira systems that can be abused for spam.
In case 1, talk to your admins about getting fewer emails.
In case 2, forward one email from the site to abuse@atlassian.com. You don't need to add anything to it, send over many of them from the same site or explain that you think it is spam, just forward it and Atlassian will check what the site is doing and kill it if it's malicious or spammy.
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