TestOneMail RBL Live DNSBL

Real-Time Threat Intelligence

Defend Your Mail Server With Live Incident Telemetry.

A high-frequency RFC 5782 DNSBL zone (bl.testonemail.com) aggregating active Postfix & Dovecot SASL brute-force probes, DMARC domain impersonators, and 24/7 Guardian reputation defense.

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Active Listings
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Level 1 (3d)
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Level 2 (14d)
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Level 3 (30d)

Blocklist Lookup

Check an IP on bl.testonemail.com

Enter any IPv4 address to check its current reputation, strike history, and automated expiration.

1. Postfix MTA Integration

Add reject_rbl_client bl.testonemail.com to your smtpd_recipient_restrictions in /etc/postfix/main.cf: 

smtpd_recipient_restrictions =
    permit_mynetworks,
    permit_sasl_authenticated,
    reject_unauth_destination,
    reject_rbl_client bl.testonemail.com

2. Postscreen Integration

If using Postscreen for pre-greeting screening, weight TestOneMail in /etc/postfix/main.cf: 

postscreen_dnsbl_sites =
    zen.spamhaus.org*3,
    b.barracudacentral.org*2,
    bl.testonemail.com*2

3. Command-Line DNS Test

Verify your DNS resolution using the standard RFC 5782 test loopback: 

dig A 2.0.0.127.bl.testonemail.com +short
# Output should return: 127.0.0.2

24/7 Blocklist Guardian

Continuous reputation monitoring for your mail servers. Get alerted immediately the moment your IP appears on any blocklist, with automated 30-minute escalation.

Monitoring Tiers
Tier 1: Standard
Free
  • 12-hour routine scans
  • 1-hour incident escalation
  • 32 DNSBL zones monitored
  • Instant email alert notifications
Popular
Tier 2: Pro
£9 /mo
  • 6-hour routine scans
  • 30-minute incident escalation
  • High-priority DNSBL queue
  • On-demand instant re-scans
Tier 3: Ultimate
£19 /mo
  • 1-hour routine scans
  • 30-minute incident escalation
  • Maximum deliverability defense
  • Unlimited manual scans

Request Delisting or Contest a Listing

Level 1 (transient/first-time offenders) are granted instant self-service delisting with a 30-day cooldown. Repeat offenders or DMARC spoofers are forwarded to the security team for verification.

Report Attacking IPs From Your Fail2ban Mail Servers

Deploy our official drop-in Fail2ban action file to automatically feed blocked attackers into TestOneMail RBL:

Download action.d/testonemail.conf

Place the file in /etc/fail2ban/action.d/testonemail.conf and attach it to your Postfix and Dovecot jails in /etc/fail2ban/jail.local: 

[postfix-sasl]
enabled = true
action = %(known/action)s
         testonemail

[dovecot]
enabled = true
action = %(known/action)s
         testonemail