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Smarthost SMTP relay and relay IP synchronization

The Pitbull Secure Gateway outbound relay layer delivers traffic from your server securely via smarthost. Relay IP / customer synchronization and domain-based TLS policies maintain delivery quality.

Smarthost Relay TLS · AUTH
Relay status AKTİF
TLS STARTTLS
IP sync OK
Delivery %98.4
Smarthost Relay TLS Sync
TLS
Encrypted relay
AUTH
SMTP auth
Sync
IP / customer
3-5 min
Smarthost setup

Outbound delivery risks

Direct sending and shared IP reputation loss are the most common delivery issues in hosting environments.

Shared IP reputation loss

A neighbor tenant's abuse drags down your delivery too.

Relay configuration complexity

Smarthost, AUTH and TLS settings across different MTAs are error-prone.

Missing synchronization

Mismatched relay IP and customer records break policy and log scope.

TLS mismatch

STARTTLS fallback errors lead to delivery rejection or insecure transit.

Smarthost SMTP relay infrastructure

The IP Rotation feature is the operational face of Pitbull Secure Gateway outbound relay / smarthost support. Outbound traffic from Exim, Postfix, cPanel and Plesk servers is routed to the Pitbull relay address with secure SMTP AUTH and TLS connections.

Relay IP & customer synchronization

  • Relay IP pool is synchronized with customer and domain records
  • Outbound traffic is processed with correct relay identity and policy scope
  • SPF, DKIM and DMARC signatures are preserved

Domain-based TLS policies

STARTTLS fallback control and per-domain TLS requirements are configurable. Transit encryption and ISP compliance are managed from one panel.

Outbound rate limit integration

The relay layer integrates with outbound rate limit and daily limit policies. Abuse waves are filtered before relay; clean traffic is delivered securely.

Roadmap note

Multi outbound IP pool, manual active/passive IP management and dedicated IP binding are planned on the roadmap (Outbound IP Pool & Manual Reputation Control).

How to configure

  1. 1 Set MTA smarthost/relayhost address to the Pitbull relay server.
  2. 2 Obtain SMTP AUTH credentials from the customer portal.
  3. 3 Configure TLS and STARTTLS fallback policy per domain.
  4. 4 Verify relay IP synchronization from the NOC panel.
  5. 5 Send test outbound email to verify delivery and log scope.