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.
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AuthSMTP is a UK-based SMTP relay specialist founded in 2004, operating for over 20 years. Starting at $8.25/month with 5 GB traffic, it offers lean and reliable outbound email forwarding for users who need SMTP relay without analytics.
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.
Founded in 2014, MXroute is a US-based email hosting provider known for exceptional value—unlimited domains, generous storage, and SMTP relay starting at just $45/year.
Migadu is a fairly-priced email hosting service from Switzerland with an "Email Done Right" philosophy, supporting unlimited domains and unlimited aliases, billed by actual usage rather than per mailbox.
Mailercloud is an email marketing and SMTP relay platform for SMBs, offering a drag-and-drop editor, behavioral triggers, A/B testing, and detailed reporting at an affordable price.
Founded in 2016 in the Netherlands, ImprovMX is a lightweight email forwarding service. Its free plan offers unlimited alias forwarding and Catch-All capture for one domain, with 5-minute DNS setup — ideal for indie developers and site owners.
Mailjet was founded in 2010 and is headquartered in Paris, France, serving 55K+ users as an email API and marketing platform. A collaborative editor, SMTP relay, and GDPR compliance suit teams managing both marketing and transactional email for European markets.