Tender can email you when something happens on your site: a reply in a discussion you're part of, a new discussion, a discussion added to a queue. You choose which, and everyone on your site, staff or customer, chooses for themselves.
Where to find them
Click your name at the top of any page, then Account settings. The Email notifications section lists everything you can be emailed about. Tick what you want, clear what you don't, and click Save notifications. To get no email at all, clear every box.
Notifications go to your primary email address, the one under Email address in the same page.
Email me…
…about discussions I'm involved in
Replies to discussions you started, replied to or watch. This is ticked for everyone to begin with, and it's the one most customers want.
…when someone starts a new discussion
The first message of every new discussion, and nothing after that unless you take part. Customers are only told about public discussions; support staff are also told about private ones.
…when a registered user starts a discussion without logging in
Support staff only. When someone writes from an email address that belongs to an account on your site without logging in, the discussion is marked Unclaimed until a supporter claims it for that account. This tells you when that happens.
…when a discussion in my company is started or answered
For members of a company: discussions started or answered by other people in your company.
…about every discussion in a category
One box per category: every new discussion and every reply in that category, whether you take part or not. Support staff are also told about private discussions.
The Knowledge Base Feedback category (if your site turns feedback into discussions) works the same way: the supporters chosen under Settings › Knowledge Base Feedback are subscribed to it there, and can untick it here.
…when discussions are added to a queue
Support staff only. One box per queue: an email each time someone else adds a discussion to that queue. You also become a watcher of the discussion, so its replies reach you if about discussions I'm involved in is ticked.
Changing someone else's notifications
Support staff can change these settings for anyone on the site: click the person's name under Account & Settings › Users, or Edit this user on their profile, and use the same Email notifications section.