PowerMTA Professional Documentation
Operational guides designed for controlled, auditable production deployments.
PowerMTA Architecture and Message Flow
Understand submission, policy selection, VirtualMTA identity, queues, delivery, accounting and bounce processing.
Production Configuration File Design
Organize PowerMTA configuration into auditable sections and included files without creating hidden routing conflicts.
SMTP Listener Security
Secure SMTP listeners with network restrictions, authentication, TLS and explicit relay policy.
SMTP Authentication and User Isolation
Design authenticated submission accounts with least privilege and predictable routing.
VirtualMTA Identity Design
Map source IP, HELO, PTR and signing identity into stable VirtualMTAs.
VirtualMTA Pool Strategy
Choose between dedicated identities, controlled pools and deterministic sender assignment.
Sender Routing with Pattern Lists
Route approved envelope senders without unsafe catch-all behavior.
Recipient and Domain Routing
Apply provider policies and routing decisions using recipient-domain scope.
Domain Policy Engineering
Build conservative per-domain delivery controls and change them from evidence.
Rate Limits and Connection Control
Coordinate max-msg-rate, max-connect-rate, max-smtp-out and connection reuse.
Backoff Mode Engineering
Enter, operate and leave backoff mode without hiding persistent reputation problems.
Retry and Bounce Lifecycle
Set retry timing, expiration and bounce processing around operational requirements.
Queue Operations Handbook
Inspect queues, isolate growth, pause safely and avoid destructive queue handling.
Accounting and Delivery Logs
Use accounting records and logs for delivery investigation, reporting and reconciliation.
Bounce Classification and Suppression
Convert SMTP outcomes into suppression and remediation decisions.
DKIM Signing Operations
Deploy selectors, key permissions, signing domains and rotation procedures.
TLS Certificates and Outbound TLS
Configure inbound certificates and interpret opportunistic outbound TLS behavior.
DNS, HELO and Reverse DNS Alignment
Build consistent forward DNS, PTR, HELO, SPF, DKIM and DMARC identities.
Multi-IP Deployment Design
Add source IPs without creating inconsistent routing, DNS or reputation management.
MailWizz Submission Architecture
Connect MailWizz to PowerMTA with controlled authentication, bounce handling and sender identity.
Microsoft Delivery Operations
Interpret Microsoft responses and apply cautious, evidence-based delivery controls.
Gmail Delivery Operations
Monitor Gmail delivery, reputation and authentication while avoiding rate-only troubleshooting.
Yahoo and AOL Delivery Operations
Manage Yahoo/AOL deferrals, complaints and identity consistency.
PowerMTA Monitoring and Alerting
Monitor service health, queue growth, response codes, throughput and authentication failures.
PowerMTA Incident Response
Contain compromised credentials, unauthorized senders, queue abuse and configuration failures.