The marketing site's contact form: file it, then tell support.

The person who wrote it never sees this reply. A failed insert still reaches support by Slack and email before the 500, because the message exists nowhere else.

The sender gets nothing from us: mailing an address typed into a public form would let anyone have us deliver their text to anyone. Support's reply reaches them through Reply-To.

No analytics event: web sent one only for a visitor who had granted analytics consent, which a cross-origin post can't show us. The marketing site's own consent-aware analytics is the place for it.