Demanding Senders Rely on PowerMTA™

PowerMTA™ is an enterprise-grade infrastructure application for high-volume email built to address the challenges of digital messaging and integrated customer communications. PowerMTA™ provides unsurpassed reliability and delivery execution in a stable SMTP environment with granular connection controls. Superior message throughput, simplified set up and configuration and real-time analysis provide our clients with performance, deliverability, and manageability without any further investment in hardware.

Clients who have chosen PowerMTA™ as their platform of choice:


No false promises. No over-hype. It just delivers.

PowerMTA™ is the leading email gateway application (SMTP server) because it allows you to easily adopt the latest authentication specifications for sending high volume emails and to comply with ever-changing authentication policies. Whether you are looking for responsible, high-volume outbound email delivery, or as a core component for your technology stack, PowerMTA™  just delivers.

For ESPs and Marketing Automation Companies


of ESPs Choose PowerMTA™

ESPs are often contractually bound to meet stringent Service Level Agreements for delivering end-customer email campaigns. PowerMTA™ provides a sophisticated solution for multi-stream delivery execution.


For Enterprises

Automated and policy-driven messaging, combined with rock-solid sending architecture, have proven to be critical for organizations worldwide as they move away from dependence on third party platforms. PowerMTA™ allows enterprises to make this transition with confidence and ease.

schedulePowerMTA™ v4.5

PowerMTA™ v4.5 includes new advanced functionalities that permit greater flexibility and delivery control to maximize performance and deliverability.

The new PowerMTA Management Console (PMC) v1.5 supports all new PowerMTA™ v4.5 features, including IP-based reporting, saved reports, configurable session timeouts and advanced reporting filters (including sets and regular expressions).

PowerMTA™ now supports the ability to schedule deliveries through an easy-to-use header. This comes in handy for those times when you have spent a long time building a campaign or if you need to adhere to strict delivery windows.

IP rate limiting permits controlling the number of attempted recipients on a per-hour, per-minute and per-second basis for each IP address for each domain/VirtualMTA. This is primarily used by sites that define multiple IPs in a single VirtualMTA, and want to limit the attempted delivery rate for each IP address in the VirtualMTA to the respective domains.

PowerMTA™ now supports the ability to auto-increase cold VirtualMTA mail volumes with a list of daily limits.This makes it easy to have a “set it and forget it” configuration for warming new IP addresses.

To help optimize DNS usage during peak sending times,PowerMTA™ now offers the ability to precache predefined domain names to ensure the DNS name is always available.

Top-level features for v4.5 include

  • Custom retry intervals
  • Backoff reason insight
  • Enhanced job control (pause & resume)
  • Precached domains support ensures DNS info always available
  • Recipient events listing to aid in real-time queue diagnostics
  • Reverse DNS check on inbound connections
  • Address suppression lists defined with global tag allow senders to use multiple suppression lists

Make the switch

The distribution of clients switching to PowerMTA™ from other delivery platforms.




Open Source


Flawless High-Volume Delivery Windows with Scheduled Delivery Control

Recipient engagement has become the single most critical element in maximizing inbox placement, and onlyPowerMTA™’s Scheduled Delivery Control™ allows you to truly take advantage of time-based engagement metrics.

Pushing this intelligence from CRM systems toPowerMTA™ lets you create and submit the full campaign hours or even days in advance. You can even define multiple start and stop time windows for a single message.

Unmatched Architecture for Unmatched Features

PowerMTA™ handles core tasks with greater efficiency, intelligence and control than general-purpose open-source MTAs. Not only is PowerMTA™ the industry leading outbound sending platform, it can also handle inbound reply messages that have bounced. The performance, integration capabilities, and native intelligence you get built into PowerMTA™ give you a distinct advantage over your competitors who use general-purpose email relays.

PowerMTA™ also easily integrates with CRM packages such as SalesForce. You can transfer messages to PowerMTA™ for delivery through a standard interface based on SMTP, or through APIs available in common programming languages.

PowerMTA™ Process


TLS Encryption over SMTP

As the sending industry moves to a more secure and encrypted sending model, you will be increasingly required to track whether a message was delivered over a secure socket and, if so, what protocol and cipher were used. PowerMTA™ solves this problem by utilizing the Transport Layer Security (TLS) protocol over SMTP for certificate-based authentication that provides security-enhanced data transfers using symmetric encryption keys.

Advanced TLS handshake performance optimizations benefit high-volume senders by allowing you to use opportunistic TLS globally while having thousands of simultaneous outbound connections active. This feature is available with the Enterprise license.

Try PowerMTA™ for FREE today!