The vault's mail.password row is no longer deleted by this migration at
all, in either direction: deleting it unconditionally destroyed a real
password whenever MAIL_USERNAME was empty (nowhere to carry it to), and
even on a successful carry-over a later rollback had nothing left to fall
back to. Reproduced both against real MariaDB, along with a migrations-
table drift that crashed a retry on the mailboxes.key unique constraint —
fixed with Mailbox::firstOrNew() and a transaction around each direction.
down() now goes through the new Settings::forget() instead of a raw
delete, so it stops leaving the settings cache holding what it just
removed. A skipped .env password (SECRETS_KEY still unset) now prints an
operator-visible line instead of migrating clean and failing silently
later. Host/port that resolve to config/mail.php's own placeholder
defaults are treated as unset rather than as a real relay.
The seed migration also guards against SECRETS_KEY being unset at migrate
time (encrypting the .env password would otherwise throw and take the
whole migration down, on a fresh install as much as in the test suite),
and the four tests/Feature/Mail files written before this migration reset
the mailbox table in their beforeEach so they keep testing what they did
before mailboxes.key collided with the seeded rows.
nexxo