The takeover migration seeded `address` from MAIL_USERNAME and left
`username` null unconditionally, conflating the SMTP login with the
sender address. Whenever the two differ — an API-key username, a
shared relay login — mail would go out From the login instead of the
address the system was actually configured to send from, exactly like
this installation: MAIL_USERNAME is no-reply@clupilot.com but
MAIL_FROM_ADDRESS is hello@clupilot.local.
`address` now reads config('mail.from.address'), falling back to the
SMTP login only when that reads back config/mail.php's own unset
placeholder (env('MAIL_FROM_ADDRESS', 'hello@example.com') — the same
masking problem UNCONFIGURED_HOST already guards against for
MAIL_HOST). `username` is set to the SMTP login only when it actually
differs from the resolved address, since Mailbox::smtpUsername()
already falls back to address when username is null. display_name
now reads config('mail.from.name') instead of a hardcoded literal.
The placeholder domain for the four non-configured mailboxes still
comes from the SMTP login, not from mail.from.address — the two can
name different domains, and only the login's is proven to accept mail
for a given install.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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