Relay accounts allow external applications and servers to send mail via this server using SMTP AUTH.
They have no IMAP mailboxes. Managed per domain — click an account to configure send-as permissions.
No relay accounts configured. Go to a Domain to create one.
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To create relay accounts, navigate to a domain and use the Relay Accounts section.
IP relay rules (unauthenticated sending by IP) are also configured per domain.