An alternative to PowerMTA

An extended feature comparison

Power and performance

For most MTAs, disk performance is a bottleneck. This does not account for MailerQ. With MailerQ messages never hit a disk, but are stored inside RAM. It relies on RabbitMQ and NoSQL storage for message queues and deferred messages. Disk operations, as used by PowerMTA, slow down the software. MailerQ is therefore much faster.

Extensive throttling

ISPs can limit the amount of email that is allowed through their network. Throttling can be used to control the amount of emails that ISPs can receive from a certain network. MailerQ offers more parameters to base your throttling settings on than PowerMTA does. Throttling settings are applied automatically to all aliases of a domain.

Validation mechanisms

PowerMTA supports standard validation mechanisms such as SPF, DKIM and DMARC. MailerQ offers all the validation mechanisms that PowerMTA offers. However, MailerQ is the first MTA that also supports ARC. By doing this, a receiving service can also validate an email when SPF and DKIM records are rendered invalid (e.g. in the case of an intermediate service such as forwarding).

Validation mechanisms

MailerQ PowerMTA
Spam Assassin

PowerMTA configuration file

The setup of PowerMTA can be quite challenging. All settings have to be made by altering rather long and complex configuration files that are hard to maintain and difficult to update. Furthermore, PowerMTA has to be restarted after each time changes have been applied to this config file. MailerQ, on the other hand, offers a simple config file and reads most of its configuration from a relational database. This setup makes Mailerq easy to tune, both manually and programmatically. MailerQ instances pick up these configuration settings automatically by a adjustable time interval, so no restart or reload is needed.

Due to the use of the relational database it is also very easy to integrate MailerQ with your existing systems. While we cannot provide a fully automated conversion from your PowerMTA config file, we can assist you in translating your current configuration so it also works for MailerQ.

Management Console

MailerQ offers a very slick, but powerful management console. Our management console allows you to monitor the performance of your email delivery in real-time. Compared to PowerMTA, the MailerQ management console can be used to change all settings in memory to maximize deliverability on the fly (e.g. reroute emails to other IP addresses or set up flood patterns to react to server responses). And if you have multiple instances of MailerQ running in a cluster, you can easily switch between them. All of this makes MailerQ really easy to maintain and update.

Discover our Management Console

Management Console

MailerQ PowerMTA*
Live SMTP traffic monitor
Live logfile monitor
Delivery settings
Automatic recognition of domain groups
Pause and resume campaigns based on message tags

* The PowerMTA management console is only available from version 4.5 with a separate license.


While MailerQ also provides central log files, the use of RabbitMQ and JSON enables users to get more detailed information about successful or unsuccessful mail deliveries. Log files are much more limited compared to the JSON result objects. For example, the result JSON also holds a chain of all delivery attempts so you can exactly see what happened to your mail before it got delivered or failed.

MailerQ's management console also gives you direct access to its internal data structures and network traffic, so that you no longer need own tools to see exactly what your MTA is doing. We offer a live overview for both SMTP, logs and the rendered emails.

Contact us

Changing your MTA is a decision not easily made. We understand that. Looking for an alternative MTA takes time. We are here to answer your questions and take away possible concerns. That's why we offer guidance, even adjustments are possible if that helps you to switch MTAs smoothly.

Thank you for contacting us, we'll get back to you as soon as possible.

Injection mechanisms

MailerQ PowerMTA
Pickup directory
Command Line Interface
Message compression before sending

MIME handling

MailerQ PowerMTA
Header insertion/modification
CSS stylesheet to attributes
JSON to MIME conversion
DKIM message signing
ARC message signing

Incoming messages

MailerQ PowerMTA
DMARC report handling
DSN handling
Local address database

Advanced settings

MailerQ PowerMTA
Support for clustering
Support for chaining
Smarthost support
C/C++ plugin API

Delivery parameters

MailerQ PowerMTA
Domain MTA and IP based rates
Support for per-message overrides
SMTP reply pattern matching
Configurable deferral periods

Supported SMTP extensions

MailerQ PowerMTA
DNS handling

Get started with MailerQ

Just follow the MailerQ installation guide to get MailerQ up and running on your own computer or on a server.

Create a trial

It's time to change

We understand that your MTA is an important and integrated part of your business, replacing your old MTA has never been easier with MailerQ, with our team of engineers and MTA integration specialists we will reduce risks involved in replacing your old infrastructure and provide you with cutting edge technology. If there ever was a time for a replacement, it is now. We have a better alternative!

MailerQ is fast due to its non-blocking architecture. Emails don't pile up just because there is one slow receiving server. MailerQ will use multiple threads to maximize your sending potential and make every bit of email sending process as smooth as possible.

Furthermore, MailerQ tries to skip the slowest part of your servers: the hard drive by using RabbitMQ queue for queuing emails. Since, RabbitMQ stores it's queues inside RAM memory (the fastest memory on your server) it serves emails lightning fast.

You can install MailerQ and send huge volumes without the need for big investments in hardware or disks. With our alternative solution you can shut down most of your old MTA machines because of MailerQ's better performance.

MailerQ is flexible. It uses message queues and JSON, giving you full control over your email flow. With this alternative you can monitor and intervene when necessary. Prioritizing and routing has never been easier.

MailerQ is competitive. It beats every MTA in performance and pricing, and it has all the features that you could find in alternative MTAs.