what is the invitation sender address?

Question

When using Testflight, external beta testers receive an invitation email with a link to open in Testflight.

1. is this email sent automatically or do I have to trigger it ?
2. when a new tester is added to the roster, does he automatically receive an invitation email ?
3. what is the sender address of the invitation email ? Can I set it ? Is it set in stone ? If so, I need to ask my testers to whitelist it.

Answer 1

In response to your questions:

1. After your beta is approved, a button will appear saying "Send Invites". Clicking this will send out the invites to your beta testers.
2. When you add a new tester, you will be prompted to send them an invite in order to add them, so yes.
3. It is sent from do_not_reply@apple.com, and you cannot change this.