MailPace is a US-based email delivery service founded in 2020, specializing in transactional email tracking and deliverability optimization with SMTP/API dual-channel access and real-time tracking capabilities.
Mailmeteor is a France-based Gmail mail merge and email tracking tool founded in 2015. It enables personalized bulk sending, email tracking, and analytics directly within the Gmail interface — a popular choice for cold email outreach.
GlockApps is a US-based email deliverability testing platform founded in 2015, offering inbox placement detection, DMARC/SPF/DKIM analysis, spam scoring, and blacklist monitoring across 120+ sources.