MailerQ is a mail transfer agent (MTA) for sending large volumes of email each day. The software is installed on Linux servers in the customer's own infrastructure and includes DKIM, SPF, DMARC, TLS and ARC authentication, throttling and monitoring, a web management console and a REST API. Operators use it to run their own high-volume mail delivery rather than relying on an external sending service.
MailerQ is a product of Copernica B.V., based in Amsterdam in the Netherlands, which states that it runs its own servers in the Netherlands. Because the software runs on the customer's infrastructure, the operator decides where mail is processed and stored, and the vendor does not host customer data itself. The product page does not contain a GDPR statement or describe a data processing agreement, and no licence is named. For a European organisation, the sovereignty of this component depends mainly on the infrastructure it chooses.