The verifier returned (True, 'mx_unreachable') when it couldn't complete a port-25
probe to ANY MX — marking 438,163 addresses email_verified=TRUE. But these are NOT
dead: they're dominated by Comcast (13.7k), AT&T/SBCGlobal (13.5k), Verizon, Cox,
Charter, Frontier, etc. — major ISPs that deliberately tarpit/refuse probes from
unknown IPs. Confirmed from prod: comcast MX connects + returns 220. The probe
failure ≠ undeliverable.
Fix: return (False, 'mx_probe_blocked') — MX exists, deliverability UNKNOWN, must
be confirmed by a real send. Excluded from PW campaigns; prime burner-verification
target (burner_list_verify upgrades it to send_confirmed on delivery). Existing
438,163 mx_unreachable rows reclassified in prod to mx_probe_blocked / verified=FALSE.
- build_trucking_campaigns.py: nightly script that creates 8 Listmonk campaigns
per day (4 TZ x 2 types: MCS-150 overdue 2k/TZ, inactive USDOT 1k/TZ)
at 4AM ET / 5AM ET (CT) / 6AM ET (MT) / 7AM ET (PT). Deduplicates via
listmonk_sent_at column.
- migration 083: add listmonk_sent_at + listmonk_campaign_type to fmcsa_carriers
- email_verifier.py: bump max_workers from 5 to 20 for 4x faster throughput
- cron: daily pw-trucking-campaigns at 08:00 UTC (3 AM EST)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Campaign emails send from .71 via Postfix (now explicitly bound).
Verification RCPT TO probes go from .72 to protect sending reputation.
Configurable via VERIFY_SOURCE_IP env var.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Before checking the real address, sends a random 20-char address to
the domain. If the server accepts it (250), the domain is catch-all
and individual verification is meaningless. Result cached per domain.
Existing known catch-all list (gmail, outlook, etc.) still bypassed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
