Your PDS sends email for sign-in codes, password resets and email confirmations. Choose how it's sent on Settings, then Email.
Managed (our relay)
We send it for you, from an address on your PDS's domain (you choose the part before the @). For your own domain, add the two DKIM records the tab shows; email starts going out through us once we've verified them.
Custom (your own mail server)
Enter your mail server's host, port, security and login. We check that it's actually reachable, before saving.
Contact address
The address shown to your accounts for questions about your PDS.