Postmark

Acquired

Chicago, Illinois, United States · Founded 2009

11-50 employees · $10M

Sourced & current · updated Oct 22, 2026Website

Postmark is a transactional email service provider focused on reliable delivery of application emails with detailed analytics and deliverability tools.

Where they sit

Stack tier: Extended Ecosystem (D)

Email Marketing

Leading specialized transactional email service provider focused on reliability and deliverability

Ownership

Parent: ActiveCampaign