SMTP2GO

SMTP2GO is a long-running transactional service that focuses on SMTP-relay delivery. Plans are simple, and the public pricing page lists feedback loops, blacklist monitoring, spamtrap detection, and real-time analytics.

At an early stage the deciding factors are what the free tier actually covers, what the first paid invoice looks like, and how much of a founding engineer's week the setup costs. Feature depth that only matters at a million sends a month is noise until it is not.

Against a waitlist, a launch announcement, onboarding email, and the first transactional sends, SMTP2GO covers developer experience, SDK breadth, and webhook coverage, and does not cover operating track record and scheduling. Whether that gap matters depends on how central those are to the build.

• Free tier: 1,000/mo permanent
• Best published rate per 1,000: Tiers not published in comparable form
• Starts at: $10/mo for 10,000 emails
• DX score: 7/10
• Deliverability: Strong deliverability tooling for an SMTP-first service, including feedback loops, blacklist monitoring, spamtrap detection, and bounce tracking.
• Operating since: 2006
• Scheduling: No
• SDKs: node, python, go, ruby, php
• Webhooks: Yes

Strong deliverability tooling for an SMTP-first service, including feedback loops, blacklist monitoring, spamtrap detection, and bounce tracking.

SMTP relay use cases where deliverability is the primary criterion.