MX gateway and relay server integration for SmarterMail environments

Pitbull integration with SmarterMail

In environments using SmarterMail, Pitbull integration works on two channels:

• Inbound: DNS MX records point to the Pitbull gateway; Rspamd-based filtering, quarantine and policy engine secure inbound traffic.
• Outbound: Outbound traffic passes through Pitbull smarthost relay via SmarterMail Outgoing Gateway settings.

Relay Server Configuration

In SmarterMail Admin go to Settings > Protocols > SMTP Out > Outgoing Gateways and add a new gateway with the Pitbull relay address, port and SMTP AUTH credentials.

Inbound MX Gateway

• Point domain MX records to the Pitbull gateway address (priority 10)
• Rspamd spam, phishing and malware filtering at the gateway layer
• Malicious attachment scanning via ClamAV / Avast REST
• SPF, DKIM and DMARC checks + score breakdown
• Suspicious messages isolated in quarantine; admin-approved release workflow

Outbound Relay Settings

To route outbound traffic to the Pitbull relay on SmarterMail:

SmarterMail Admin:
  Settings > Protocols > SMTP Out > Outgoing Gateways
    [+ New Gateway]
    Server: relay.pitbull.com.tr
    Port: 587
    ☑ Requires Authentication
    Username: tenant@pitbull.com.tr
    Password: RELAY_TOKEN
    ☑ Use TLS
    Priority: 1 (primary relay)

This configuration passes outbound traffic through the Pitbull outbound filtering engine. SMTP Abuse Radar, per-tenant rate limits and Emergency Outbound Lockdown are activated.

Authentication

• Add Pitbull include to SPF
• Enable DKIM signing from Pitbull panel and publish DNS TXT record
• Start DMARC at p=none and monitor reports

Operational Visibility

Monitor delivery rates, reject reasons, queue status and GeoIP/ASN distribution on NOC screens. Deliver periodic security summaries to management teams with executive PDF reports.