Mail::to($x)->queue($mail) resolves the DEFAULT mailer, and
Illuminate\Mail\Mailer::queue() (vendor Mailer.php:482) does
`$view->mailer($this->name)->queue($this->queue)` — overwriting
MaintenanceAnnouncementMail/MaintenanceCancelledMail's own 'cp_maintenance'
with the default mailer's name ('array' in tests, 'log'/whatever
MAIL_MAILER is in prod) before the job is even built. Both mails kept
sending through the old .env account instead of MailboxTransport. CloudReady
was never affected — MailChannel.php:66 preserves a notification's own
mailer.
Fix: name the mailer before queueing — Mail::mailer($mail->mailer)->to(...).
$this->name on the resolved Mailer is then already $mail->mailer, so the
vendor overwrite becomes a no-op instead of a silent downgrade. Confirmed by
reading the vendor source, not assumed.
SenderAddressTest's "names the purpose mailer..." test asserted
$mail->mailer on a bare, never-queued mailable, which proves nothing about
what survives queueing — the constructor sets it right regardless of what
MaintenanceNotifier does with it. Replaced it with one that drives
MaintenanceNotifier::deliver() under Queue::fake() and inspects the pushed
SendQueuedMailable's mailable. Verified it fails against the pre-fix code
first (the pushed job carried mailer = 'array'), then verified the fix
makes it pass, then mutated the fix away and watched it fail again.
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