Mailsuite is a Barcelona-based software company that builds email productivity tools for Gmail. Founded in 2013, it is best known for Mailtrack, the original email tracker for Gmail, used by more than 3 million people to know whether the messages they send have been read. Alongside Mailtrack, Mailsuite offers mail merge campaigns, document tracking, e-signatures and video messages, all working inside Gmail rather than as a separate application. Mailsuite is GDPR compliant, audited annually by Google, ISO certified for information security management, and a Google Cloud Partner.