Apple Mail ignores RFC 6186 SRV autodiscovery and 'Microsoft Exchange'
needs EWS/EAS that Stalwart doesn't speak — so custom-domain users were
stuck typing IMAP/SMTP servers manually. New session-gated portal route
generates an Apple configuration profile (IMAP 993 + SMTP 465 on the
runtime mail host, username = address, NO password embedded — profiles
are plaintext, Apple prompts at install). 'Add to Apple Mail' buttons on
the three credential screens (invite result, mailbox created, password
reset). CalDAV/CardDAV payloads join when DAV is reachable from outside
(the node's :443 belongs to Traefik for now).
Ronni Baslund