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.

A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.

Against trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail, SMTP2GO covers multi-tenant support, event stream, the suppressions API, 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.

• Multi-tenant: Yes
• Event stream: Yes
• Suppressions API: Yes
• Operating since: 2006
• Scheduling: No
• Best published rate per 1,000: Tiers not published in comparable form
• Deliverability: Strong deliverability tooling for an SMTP-first service, including feedback loops, blacklist monitoring, spamtrap detection, and bounce tracking.
• Webhooks: Yes
• Starts at: $10/mo for 10,000 emails

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.