You got **Bounce diagnostics mention blocked-list or spam concentration**. Lumail classified enough permanent bounces (at least 10, and ≥ 2% of sent in the window) with blocked-list / spam-style diagnostic codes.

This is **not** a full public-blocklist monitor. It only uses bounce text Lumail already received.

## What to change

Treat it as a reputation or list problem, not a missing DNS row (unless you also have domain auth alerts).

1. Open **Settings → Deliverability** and read the bounce diagnostics.
2. Stop sending to the same unengaged list.
3. Remove the bouncing addresses — they are already suppressed; do not re-import.
4. If a specific destination (e.g. one consumer ISP) dominates, pause that segment and fix list quality before retrying.
5. Confirm SPF, DKIM, and DMARC are passing — [domain guides](/docs/deliverability).
6. If you recently moved from another ESP, expect leftover blocklist / filter memory. Warm up with engaged recipients only.

If the copy mentions a public list (Spamhaus, etc.), request delisting **only** after the list is clean and auth passes. Relisting is immediate if you keep sending the same traffic.

## After it recovers

The alert resolves when blocked-list bounce volume drops below the threshold (under 10 events or under 2% of sent on an adequate sample).

## Related

- [How to lower bounce rate](/docs/deliverability/how-to-lower-bounce-rate)
- [How to lower complaint rate](/docs/deliverability/how-to-lower-complaint-rate)
- [Sender Health](/docs/features/sender-health)