Email API comparison
Both put inbox placement first. SMTPfast adds an API-first workflow with broadcasts, forms, and live logs alongside the same transactional reliability.
SMTP2GO is a reliability- and deliverability-first sending layer with globally distributed infrastructure, an SMTP relay, and an API. SMTPfast covers the same transactional core but leads with a developer-first REST API and adds broadcasts, signup forms, live event logs, and SES-backed domain controls in one dashboard.
SMTPfast
Both price on send volume rather than contacts. SMTP2GO layers in SMS, subaccounts, and agency tooling; SMTPfast layers in a developer API, broadcasts, forms, and live logs.
SMTP2GO
Best for: Teams that want deliverability-first SMTP relay for app and WordPress email.
The useful differences for teams evaluating SMTP2GO.
Choose SMTP2GO if you want a deliverability-first SMTP relay with global infrastructure and hands-on support, especially for WordPress or agency setups. Choose SMTPfast if you want the same transactional reliability with an API-first workflow, broadcasts, signup forms, live event logs, and SES-backed domain controls in one place.
Try SMTPfast free| Feature | SMTPfast | SMTP2GO |
|---|---|---|
| Pricing model | Simple volume plans | Volume-tiered subscriptions with per-1,000 overage |
| Public free tier | 3,000 emails/month | 1,000 emails/month (200/day) |
| API & Sending | ||
| REST API | ||
| Resend-compatible payloads | ||
| SMTP relay | ||
| Batch sending | 100/request | |
| Idempotency keys | ||
| Inline images (cid) and automatic plain text | Not published | |
| Customer webhooks | ||
| Share links for sent emails | Not published | |
| Webhook event replay | Failed only, dashboard | |
| Email metrics API | ||
| Marketing & Audience | ||
| Broadcast campaigns | ||
| Signup forms | ||
| Broken link check before sending | Not published | |
| Spread a broadcast over hours | 15 min to 72 h | Not published |
| Workflow automation | Planned | |
| Dynamic segments | Planned | |
| Hosted templates | Handlebars | |
| Deliverability & Safety | ||
| DKIM/SPF/DMARC guidance | ||
| Custom MAIL FROM | ||
| Suppression management | ||
| Marketing opt-outs that keep transactional mail flowing | Per-email category | Not published |
| Custom tracking domain | Paid plans | |
| Live event tail | ||
| Warmup and abuse controls | ||
| Platform Model | ||
| Inbound email | Paid plans | |
| Inboxes with threads and drafts | Paid plans | Not published |
| MCP server for AI agents | Not published | |
| Terraform provider | Official | Not published |
| Agent skill for coding assistants | Official | Not published |
| API key scopes | Per key | Not published |
| Open source | Evaluating | |
| Self-hostable | Evaluating | |
| Team members and roles | Paid plans | No SSO |
| No per-seat pricing | ||
SMTP2GO is a strong deliverability-first SMTP relay. SMTPfast is a better fit when you want an API-first workflow with broadcasts, signup forms, live logs, and SES-backed controls in the same dashboard.
Choose SMTP2GO when its core strength matches your team: Teams that want deliverability-first SMTP relay for app and WordPress email. SMTPfast is a better fit when you want a developer-first SES-backed API with queues, webhooks, tracking, suppressions, and a focused dashboard already handled.
Most migrations start with domain verification, a test API key, and one low-risk transactional email path. Resend-compatible payloads are especially quick to move; older providers may require mapping template, webhook, and suppression behavior.