Send large volumes of email with maximum control at unparalleled speed

Try out for free Plan a demo

What is MailerQ

A high-performance Mail Transfer Agent (MTA)

MailerQ is built to deliver large amounts of email. Our solution enables you to manage a powerful on-premise SMTP server. Our easy-to-use Management Console provides real-time insights into all traffic going through MailerQ and enables you to control an extensive set of deliverability settings on the fly. With MailerQ messages never have to touch a disk, so you can say goodbye to your expensive hardware and start delivering with higher performance using low-cost servers.

MailerQ is designed with a strong focus on performance. Due to message queueing in memory and a multi-threaded non-blocking architecture, a single MailerQ instance can easily handle thousands of messages per second.

Five different injection methods, plugin support, REST API, and use of open source components like RabbitMQ and MySQL/PostgreSQL make MailerQ a highly flexible email sending solution.

MailerQ comes packed with functionality necessary for every serious sender. Working together with our customers and industry leaders allow us to continuously bring out the latest and most relevant improvements.

Latest News & updates


MailerQ previously published an article on this website in which we compared the features and the speed of MailerQ and a competing product, PowerMTA. The comparison was made using an unauthorized installation of a test version of PowerMTA and an unauthorized license without consent of Port25, the copyright-holder of the PowerMTA software. The conclusions of this test were therefore unreliable, not verifiable, and for these reasons false and misleading. This was wrong. We have removed the comparison page from our website and apologize to Port25 and anyone who reviewed the comparison page on our website.

Email Expert Talk 6: Lina Jankevičiūtė, Deliverability Manager at Omnisend

In our series 'Email Expert Talk' we discuss all things email with distinguished experts who know about the struggles and strategies of working with high volume emails. We talk about how they cope with daily challenges, what their opinions are on ...

Read more news

The most powerful MTA

MailerQ comes packed with features right out of the box to improve your email deliverability.

Real-time monitoring

The management console allows for real-time insights in delivery attempts and results, queues, error logs and a lot more per MTA, IP, target and even per customer, campaign or message type.

Advanced volume control

With email throttling you can decrease or increase your sending speed by specifying the maximum message volumes, the number of connections, the timeouts and more per inbox provider.

Feedback processing

Response patterns allow you to classify bounces, process feedback loops and adapt MTA behavior based on server responses. This will help you maximize your email deliverability and sender reputation.

IP Warm-up

Email throttle schedules allow you to define warm up trajectories by creating schedules that describe what delivery rates to use on which day. This ensures you get the most out of your new IP addresses.

Authentication & security

MailerQ supports DKIM, SPF, DMARC, TLS and as the first MTA ever also ARC (Authenticated Received Chain) methods for email authentication.

Quick interference

You can monitor SMTP connections and error logs and easily pause deliveries or throw errors for specific IPs, targets, customers, campaigns or message types.

Management console

MailerQ comes with a web-based management console, where you adjust deliverability settings on the go. You can use this dashboard if you do not want to connect to the database. The management console also allows you to monitor the real-time performance of your deliveries and IPs, reroute emails to other IP addresses or set up flood patterns to react to server responses.

With MailerQ, you don’t just get an email sending powerhouse.

You get a dedicated partner with over 15 years of experience, ready to help you bring your email operations to the next level.

Trusted by senders of all sizes

< >
MailerQ allows us to send much higher volumes at a lower price, be more compliant with ISPs’ requirements, generate very detailed feedback and protect our network and deliverability.
Wojtek Ptak, CTO of FreshMail
Email bidding
One of the major benefits of MailerQ is the fact that managing the system can be done with a friendly interface instead of using the terminal to plunge through endless config files.
Sérgio Cunha, Senior Integrations Specialist
We have been able to significantly reduce our hardware and maintenance costs whilst simultaneously increasing our monthly traffic.
Teemu Hemmilä, Liana Technologies
With MailerQ we have gained full control over our e-mail delivery without sharing data of our clients with third parties. Superb e-mail delivery is essential for the community platform that we are building, and that is exactly what got.
Frederik Bosch, Partner at Genkgo
We regained flexibility and are able to send out thousands of messages per minute without the need to micromanage our sending efforts.
Ralph van Asperen, Repper