Departure was launched to address the shift in the industry toward greater integration of digital marketing.
The agency helps clients embrace emerging technologies and progressive marketing concepts.
Departure's director of account management Emily Rex said it decided to use Alterian's Dynamic Messenger email application because of its flexible template, analytics-driven message creation, reporting capabilities and knowledgable support team.
Rex said: "Departure's goal is stay one-step ahead of the industry's evolution toward digital marketing. As such, we needed an email platform that would grow with our clients into the future."
David Eldridge, chief executive of Alterian, said the company was building relationships with interactive and digital agencies based on its forward-thinking vision and product roadmap.
He said: "Alterian's partnership with Departure, a progressive agency on the cutting edge of new media, further illustrates the value we provide to our partners by offering analytics-based insight and advanced functionality to conceptualise and execute email campaigns."