Postmark was founded in 2009 and is headquartered in Philadelphia, USA. It is a high-deliverability transactional email platform with 99% of emails delivered within 30 seconds, strictly for transactional scenarios such as password resets and order confirmations.
SMTP2GO is a New Zealand-based email delivery platform founded in 2012, offering SMTP relay and REST API. Free tier includes 1,000 emails/month, email logs, webhooks, and sending analytics — ideal for small teams and developers.
SendGrid Email is Twilio's email delivery API product processing billions of emails daily, featuring v3 API, SMTP relay, delivery analytics, dynamic templates, and sender reputation management.
Postmark Email is a high-deliverability transactional email service known for sub-1-second average delivery, Message Stream technology, and precise bounce handling — the developer's choice for transactional email.
Pepipost is an India-based email API service provider founded in 2014, now part of Netcore Cloud. It specializes in SMTP relay and transactional email delivery, processing billions of emails daily with developer-friendly APIs and high deliverability.
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.
Mailjet, founded in 2010 in Paris, France (now part of Sinchn/Pathwire), provides a unified transactional and marketing email API service trusted by 55,000+ customers, with 6,000 free emails/month and full GDPR compliance.
Mailgun Email is a developer-focused email API product offering RESTful API, SMTP relay, real-time analytics, smart bounce management, and event webhooks, processing billions of emails daily.
Maileroo is an Australia-based email delivery service founded in 2020, offering a simple API and SMTP interface designed for developers, with low cost and developer-friendly pricing for startups and small teams.
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.
Elastic Email is a Canada-based email sending service founded in 2013, offering pay-as-you-go pricing with no minimums, dual API/SMTP support, and a free plan. Ideal for budget-conscious developers and small teams.
Founded in 2014 and headquartered in Exton, Pennsylvania, SocketLabs is a developer-focused email infrastructure platform offering SMTP relay and REST API for transactional and marketing email delivery.