PowerMTA v3.7
Configuration Library
Copy-ready teaching examples for common PowerMTA architectures and operational policies.
Single-IP production baseline
A conservative baseline with one VMTA, listener restrictions, logging and destination defaults.
Multi-IP VMTA pool
Defines separate identities and a pool for controlled distribution.
MailWizz authenticated relay
A submission listener and dedicated SMTP user for MailWizz.
Sender-domain routing
Routes approved envelope sender domains to defined VMTAs.
Authorized MAIL FROM control
A pattern-led design for allowing known sender domains and rejecting unauthorized identities at the application boundary.
Microsoft conservative policy
Low concurrency and progressive retry settings for Outlook/Hotmail traffic.
Gmail conservative policy
A measured Gmail policy emphasizing stable rate and response monitoring.
Yahoo/AOL policy
Shared provider policy with conservative connection and message limits.
GMX/WEB.DE policy
Destination policy for GMX and WEB.DE traffic.
Backoff response patterns
Example patterns for temporary reputation and rate deferrals.
Multi-domain DKIM signing
Separate selectors and keys for multiple customer domains.
CNAME-delegated DKIM
Provider-side selector naming for SendGrid-style customer delegation.
Mandatory TLS partner route
Require TLS only for an explicitly controlled partner destination.
Delivery and bounce accounting
Accounting records suitable for operational reporting.
Queue recovery policy
Reduced pressure during queue recovery after a provider incident.
Transactional/marketing separation
Separate pools and policies for unrelated traffic classes.
Per-application SMTP users
Unique credentials and source separation for each sending application.
SMTP listener hardening
Restrict listeners, relay permissions, and insecure authentication.
Warm-up pool baseline
Dedicated identities and conservative provider rates for warm-up.
Log and accounting retention
Operational file layout for rotation and ingestion.