SMTP2GO
SMTP2GO, run by Sand Dune Mail Ltd in Christchurch, New Zealand, relays application email over SMTP and a REST API from US, EU and Australian data centers, and sells SMS as a paid add-on. Email plans are monthly or annual USD subscriptions with included volume and per-1,000 overage; the Free plan allows 1,000 emails a month.
Transactional emailSMSOTP & verification
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Strengths, weaknesses and fit
Strengths
- Free forever: 1,000 emails per month (Transactional email)
- Official MCP server
- Official agent skills published
- Restricted API keys with scoped permissions
- Test mode or test credentials documented
- Official SDKs in 7 languages
Weaknesses
- Webhooks are not signed
- No OAuth 2.0 — API keys only
- Limited channels: Email and SMS only
Not a fit if…
- you must verify that callbacks really come from the provider
- you build a multi-tenant app that acts on customers' own accounts
- you want several channels from one provider
Generated from threshold rules over the dated facts below, not written by hand. Rules with unverified inputs are skipped.
Transactional email: SMTP2GO Email API (v3) and SMTP relay
checked| Country | Availability | Restrictions | Payment scenarios |
|---|---|---|---|
| United States | YesOfficial docsSMTP2GO pricingBilling, Pricing and Plans FAQ | Every sender must be a verified domain or single sender address. New accounts are reviewed: the initial quota is 1,000 emails (paid accounts 1,000 a day) and excess mail is held until activation. Mailing lists must be 100% opt-in, mailed within the previous three months and carry an unsubscribe link; the Terms ban listed industries (e.g. online trading, credit repair, gambling promotions, negative-option billing payment demands). The Free plan is capped at 200 emails a day and 25 an hour until a sender domain is verified.Official docsGetting Started with the APINew Account Limits and the Review Process | YesOfficial docsAPI TemplatesSMTP2GO Terms of Service |
| Brazil | YesOfficial docsSMTP2GO pricingBilling, Pricing and Plans FAQ | Every sender must be a verified domain or single sender address. New accounts are reviewed: the initial quota is 1,000 emails (paid accounts 1,000 a day) and excess mail is held until activation. Mailing lists must be 100% opt-in, mailed within the previous three months and carry an unsubscribe link; the Terms ban listed industries (e.g. online trading, credit repair, gambling promotions, negative-option billing payment demands). The Free plan is capped at 200 emails a day and 25 an hour until a sender domain is verified.Official docsGetting Started with the APINew Account Limits and the Review Process | YesOfficial docsAPI TemplatesSMTP2GO Terms of Service |
| Mexico | YesOfficial docsSMTP2GO pricingBilling, Pricing and Plans FAQ | Every sender must be a verified domain or single sender address. New accounts are reviewed: the initial quota is 1,000 emails (paid accounts 1,000 a day) and excess mail is held until activation. Mailing lists must be 100% opt-in, mailed within the previous three months and carry an unsubscribe link; the Terms ban listed industries (e.g. online trading, credit repair, gambling promotions, negative-option billing payment demands). The Free plan is capped at 200 emails a day and 25 an hour until a sender domain is verified.Official docsGetting Started with the APINew Account Limits and the Review Process | YesOfficial docsAPI TemplatesSMTP2GO Terms of Service |
SMS: SMTP2GO SMS Messaging (API and email-to-SMS)
checked| Country | Availability | Sender types | Restrictions | Payment scenarios |
|---|---|---|---|---|
| United States | YesOfficial docsSMS Messaging OverviewHow to Apply for a Dedicated SMS Phone Number (U.S.) | dedicated US number (toll-free, verification required)Official docsSMS Messaging OverviewHow to Apply for a Dedicated SMS Phone Number (U.S.) | A separate dedicated number is required for each business. Opt-in proof must be visual or digital (no verbal opt-ins); Canada needs double opt-in. SHAFT content, high-risk financial services, debt collection, gambling, cryptocurrency and cannabis/CBD are disallowed; toll-free numbers cannot carry loan solicitation, gambling or CBD promotions. Brand ID and STOP language in every message, no ALL CAPS, no public link shorteners, links to the sender's own site only.Official docsHow to Apply for a Dedicated SMS Phone Number (U.S.)SMS Terms of Service | PartialOfficial docsSMS Terms of Service |
| Brazil | YesOfficial docsSMS Messaging Overview | — | — | PartialOfficial docsSMS Terms of Service |
| Mexico | RestrictedOfficial docsSMS Messaging Overview | — | — | — |
OTP & verification: No verification API: the SMS API and email-to-SMS deliver codes your app generates
checked| Support | NativeOfficial docsSMS Messaging OverviewSend SMS (API reference) |
|---|---|
| Outbound | YesOfficial docsSend SMS (API reference) |
| Channels sms | YesOfficial docsSMS Messaging OverviewSend SMS (API reference) |
| Channels whatsapp | NoOfficial docsAPI Features OverviewSMTP2GO llms.txt (marketing site) |
| Channels voice | NoOfficial docsAPI Features OverviewSMTP2GO llms.txt (marketing site) |
| Channels email | YesOfficial docsSend a standard email (API reference)SMTP Relay |
| Managed codes | NoOfficial docsSMTP2GO developer docs llms.txtSend SMS (API reference) |
| Fraud protection | PartialOfficial docsSMS Messaging Overview |
| Rate limiting | NoOfficial docsSMS Messaging OverviewAdd a new API key (API reference) |
| Silent network auth | NoOfficial docsSMTP2GO developer docs llms.txt |
| Localized templates | NoOfficial docsSend SMS (API reference)SMS Messaging Overview |
| Analytics | PartialOfficial docsSMS Messaging OverviewWebhooks Overview |
| Country | Availability |
|---|---|
| United States | YesOfficial docsSMS Messaging OverviewHow to Apply for a Dedicated SMS Phone Number (U.S.) |
| Brazil | YesOfficial docsSMS Messaging Overview |
| Mexico | RestrictedOfficial docsSMS Messaging Overview |
SMTP2GO pricing
checkedPrices as printed on the vendor's pages, in the vendor's currency. Scenario totals are computed from the listed components; carrier and Meta pass-through fees are shown separately and are not in the totals.
Transactional email
Same prices in United States, Brazil and Mexico.
| Plan | Price | Source |
|---|---|---|
| Free Plan | Free | Official docs checked |
| Starter (10,000 emails) | $15.00 / month | Official docs checked |
| Starter (50,000 emails) | $30.00 / month | Official docs checked |
| Professional (100,000 emails) | $75.00 / month | Official docs
checked |
- 10,000 emails / month: $15.00 on Starter (10,000 emails)
- 100,000 emails / month: $75.00 on Professional (100,000 emails)
SMS
| Plan | United States | Brazil | Source |
|---|---|---|---|
| SMS add-on | — dedicated US number Dedicated number, United States / Canada (+1): $5.00 Cheapest paid email plan required for SMS (Starter 10,000, monthly): $15.00 | — shared number pool Cheapest paid email plan required for SMS (Starter 10,000, monthly): $15.00 | Official docs
checked |
Transactional email: free access
Free forever: See detailsOfficial docsSMTP2GO pricingFree Plan
Trial: NoneOfficial docsBilling, Pricing and Plans FAQ
SMS: free access
Free forever: NoneOfficial docsFree PlanSubscription Plan Differences Explained
Trial: NoneOfficial docsBilling, Pricing and Plans FAQSMS Messaging Overview
OTP & verification: free access
Free forever: NoneOfficial docsFree PlanSubscription Plan Differences Explained
Trial: NoneOfficial docsBilling, Pricing and Plans FAQSMS Messaging Overview
Developer & AI readiness
checkedWebhook signatures
Not signed
Official docs
Agent skills
OfficialOfficial docs- Claude Codesmtp2go-send-email
- Codexsmtp2go-send-email
No-code and manual editing
| Template editor | YesOfficial docsAPI TemplatesGetting started with Templates |
|---|---|
| Edit code and visual together | YesOfficial docsGetting started with TemplatesAPI Features Overview |
Works with AI app builders
Server code needed on every builder: YesOfficial docsGetting Started with the APIWebhooks Overview
| Platform | Native integration | Official guide | Secrets |
|---|---|---|---|
| Claude Code | YesOfficial docsSMTP2GO MCPSMTP2GO Agent Skills | developers.smtp2go.com/docs/mcpOfficial docsSMTP2GO MCP | Environment variable SMTP2GO_API_KEY (MCP header or skill); avoid --scope project with a literal keyOfficial docsSMTP2GO MCPSMTP2GO Agent Skills |
| Cursor | YesOfficial docsSMTP2GO MCP | developers.smtp2go.com/docs/mcpOfficial docsSMTP2GO MCP | Cursor MCP config headers with ${env:SMTP2GO_API_KEY}Official docsSMTP2GO MCP |
| Replit | NoOfficial, otherReplit Agent integrations overview | NoneOfficial, otherReplit Agent integrations overviewSMTP2GO MCP | — |
| Lovable | NoOfficial, otherLovable documentation index (llms.txt)Connect a custom MCP server as a chat connector | developers.smtp2go.com/docs/mcpOfficial docsSMTP2GO MCP | Lovable Custom MCP connector (API key as bearer token)Official docsSMTP2GO MCP |
Paying and getting support locally
How customers pay the provider itself — separate from payment scenarios for your buyers.
United States
| Billing methods | credit card, PayPal, ACH Direct Debit, wire transfer, checkOfficial docsBilling, Pricing and Plans FAQPayment Options |
|---|---|
| Local payment methods | ACH Direct Debit, checkOfficial docsBilling, Pricing and Plans FAQSMTP2GO FAQ |
| Billing currencies | USDOfficial docsBilling, Pricing and Plans FAQSMTP2GO pricing |
| Local entity / tax invoice | YesOfficial docsVendor Information (W9, invoices, DPA, security FAQ)Contact SMTP2GO (phone numbers, hours, offices) |
| Interface languages | enOfficial docsSMTP2GO pricingAbout SMTP2GO |
| Docs languages | enOfficial docsSMTP2GO developer docs llms.txtSMTP2GO Help Center locales (Zendesk API) |
| Support languages | enOfficial docsSMTP2GO Help Center locales (Zendesk API)Contact SMTP2GO (phone numbers, hours, offices) |
| Support phone | See detailsOfficial docsContact SMTP2GO (phone numbers, hours, offices)USA Data Center |
| Local office | YesOfficial docsContact SMTP2GO (phone numbers, hours, offices)USA Data Center |
Brazil
| Billing methods | credit card, PayPal, wire transferOfficial docsBilling, Pricing and Plans FAQPayment Options |
|---|---|
| Local payment methods | NoneOfficial docsBilling, Pricing and Plans FAQPayment Options |
| Billing currencies | USDOfficial docsBilling, Pricing and Plans FAQSMTP2GO pricing |
| Local entity / tax invoice | NoOfficial docsSMTP2GO Terms of ServiceVAT/GST Charged On Purchases |
| Interface languages | enOfficial docsSMTP2GO pricingAbout SMTP2GO |
| Docs languages | enOfficial docsSMTP2GO developer docs llms.txtSMTP2GO Help Center locales (Zendesk API) |
| Support languages | enOfficial docsSMTP2GO Help Center locales (Zendesk API)Contact SMTP2GO (phone numbers, hours, offices) |
| Support phone | NoneOfficial docsContact SMTP2GO (phone numbers, hours, offices) |
Mexico
| Billing methods | credit card, PayPal, wire transferOfficial docsBilling, Pricing and Plans FAQPayment Options |
|---|---|
| Local payment methods | NoneOfficial docsBilling, Pricing and Plans FAQPayment Options |
| Billing currencies | USDOfficial docsBilling, Pricing and Plans FAQSMTP2GO pricing |
| Local entity / tax invoice | NoOfficial docsSMTP2GO Terms of ServiceVAT/GST Charged On Purchases |
| Interface languages | enOfficial docsSMTP2GO pricingAbout SMTP2GO |
| Docs languages | enOfficial docsSMTP2GO developer docs llms.txtSMTP2GO Help Center locales (Zendesk API) |
| Support languages | enOfficial docsSMTP2GO Help Center locales (Zendesk API)Contact SMTP2GO (phone numbers, hours, offices) |
| Support phone | NoneOfficial docsContact SMTP2GO (phone numbers, hours, offices) |
Compliance & data protection
checkedWhat the vendor documents publicly. This is not a legal assessment and not a certification.
| Data processing agreement | YesOfficial docsVendor Information (W9, invoices, DPA, security FAQ)EU Data Center |
|---|---|
| Subprocessor list | YesOfficial docsSub-Processor List |
| Data residency options | YesOfficial docsEU Data CenterUSA Data Center |
| Residency regions | United States (Chicago IL, Reston VA), European Union (Amsterdam), Australia (Sydney)Official docsVendor Information (W9, invoices, DPA, security FAQ)USA Data Center |
| Security documentation | ISO 27001 and ISO 9001 (vendor FAQ), US data centers: ISO 27001, SOC 1 Type 2, SOC 2 Type 2, PCI DSS, EU data center: ISAE 3402, SOC 1 Type 2, SOC 2 Type 2, Australian data center: ISO/IEC 27001:2013Official docsVendor Information (W9, invoices, DPA, security FAQ)USA Data Center |
How the rating is built
| Criterion | Weight | Result | Basis |
|---|---|---|---|
| Pricing & Free Tier (25) | 46.3 / 100coverage 55 % | ||
| Free access (transactional-email) | 4.17 | 70 % | free forever: 1,000 emails / monthsrcsrc |
| Scenario price (transactional-email) | 3.33 | 60 % | 10,000 emails / month: USD 15.00 vs peer median USD 15.00 (13 providers); 100,000 emails / month: USD 75.00 vs peer median USD 74.85 (13 providers)srcsrcsrc |
| Pricing transparency (transactional-email) | 0.83 | 100 % | public self servesrcsrcsrc |
| Free access (sms) | 2.08 | 0 % | no free tier, trial or creditssrcsrcsrc |
| Pricing transparency (sms) | 1.25 | 50 % | public partialsrcsrcsrc |
| Free access (otp) | 2.08 | 0 % | no free tier, trial or creditssrcsrcsrc |
| Developer & AI Readiness (28) | 68.3 / 100coverage 95 % | ||
| MCP | 7.70 | 100 % | official (remote)srcsrcsrc |
| Agent skills | 2.10 | 100 % | officialsrcsrc |
| Assistant apps | 0.70 | 0 % | 0 official assistant appssrcsrc |
| Llms.txt | 0.70 | 100 % | publishedsrcsrc |
| OpenAPI | 0.70 | 100 % | publishedsrcsrcsrc |
| AI docs | 0.70 | 100 % | publishedsrcsrcsrc |
| Scoped keys | 1.40 | 100 % | yessrcsrcsrc |
| OAuth | 4.48 | 0 % | nosrcsrc |
| Webhook signing | 1.96 | 20 % | unsignedsrcsrcsrc |
| SDKs | 2.24 | 100 % | 7 official SDK languagessrcsrc |
| Test mode | 2.24 | 100 % | yessrcsrc |
| Idempotency | 1.68 | 0 % | nosrcsrc |
| Reputation & Reviews (25) | 96.0 / 100coverage 100 % | ||
| Review platforms | 25.00 | 96 % | global data: capterra 4.9/5 (178), g2 4.7/5 (226), trustpilot 4.8/5 (1,889) |
| Channel Coverage (10) | 40.0 / 100coverage 100 % | ||
| Channel groups | 10.00 | 40 % | 2 channel groups (native = 1, partner = 0.5)srcsrcsrc |
| Category Functionality (8) | 57.2 / 100coverage 100 % | ||
| SMTP relay (transactional-email) | 0.32 | 100 % | yessrcsrc |
| Inbound parsing (transactional-email) | 0.27 | 0 % | nosrcsrc |
| Templates (transactional-email) | 0.27 | 100 % | yessrcsrcsrc |
| Event webhooks (transactional-email) | 0.37 | 100 % | yessrcsrc |
| Suppression mgmt (transactional-email) | 0.27 | 100 % | yessrcsrc |
| Dedicated IP (transactional-email) | 0.21 | 100 % | yessrcsrcsrc |
| Log retention (transactional-email) | 0.21 | 100 % | yessrcsrcsrc |
| Scheduling (transactional-email) | 0.16 | 100 % | yessrcsrc |
| Attachments (transactional-email) | 0.11 | 100 % | yessrcsrc |
| Payment notifications (transactional-email) | 0.21 | 50 % | partialsrcsrc |
| Native payment-provider integration (transactional-email) | 0.27 | 0 % | nosrcsrc |
| Two-way messaging (sms) | 0.27 | 100 % | yessrc |
| Delivery receipts (sms) | 0.37 | 100 % | yessrcsrc |
| Sender types (sms) | 0.37 | 50 % | partialsrcsrc |
| Number provisioning via API (sms) | 0.21 | 0 % | nosrcsrc |
| Sender registration support (sms) | 0.27 | 100 % | yessrcsrc |
| Opt-out handling (sms) | 0.27 | 100 % | yessrcsrc |
| MMS / RCS (sms) | 0.16 | 50 % | partialsrc |
| Scheduling (sms) | 0.13 | 50 % | partialsrcsrc |
| Segment and Unicode rules documented (sms) | 0.13 | 100 % | yessrc |
| Payment links in messages (sms) | 0.21 | 50 % | partialsrcsrc |
| Native payment-provider integration (sms) | 0.27 | 0 % | nosrcsrc |
| Channels sms (otp) | 0.27 | 100 % | yessrcsrcsrc |
| Channels whatsapp (otp) | 0.27 | 0 % | nosrcsrc |
| Channels voice (otp) | 0.16 | 0 % | nosrcsrc |
| Channels email (otp) | 0.16 | 100 % | yessrcsrc |
| Managed codes (otp) | 0.37 | 0 % | nosrcsrc |
| Fraud protection (otp) | 0.48 | 50 % | partialsrc |
| Rate limiting (otp) | 0.27 | 0 % | nosrcsrc |
| Silent network auth (otp) | 0.21 | 0 % | nosrc |
| Localized templates (otp) | 0.21 | 0 % | nosrcsrc |
| Analytics (otp) | 0.27 | 50 % | partialsrcsrc |
| Localization & Regional Support (2) | 33.3 / 100coverage 100 % | ||
| Languages | 2.00 | 33 % | 1 of 3 target languages (en, pt, es)srcsrcsrc |
Weights and rules: rating methodology.
Sources
- SMTP2GO Terms of Service — legal, checked 23 September 2026
- SMS Terms of Service — legal, checked 23 September 2026
- SMTP2GO Privacy Policy — legal, checked 23 September 2026
- About SMTP2GO — other, checked 23 September 2026
- Contact SMTP2GO (phone numbers, hours, offices) — other, checked 23 September 2026
- SMTP2GO FAQ — other, checked 23 September 2026
- SMTP2GO product tour — other, checked 23 September 2026
- SMTP2GO llms.txt (marketing site) — docs, checked 23 September 2026
- SMTP2GO Help Center locales (Zendesk API) — other, checked 23 September 2026
- Vendor Information (W9, invoices, DPA, security FAQ) — docs, checked 23 September 2026
- Sub-Processor List — legal, checked 23 September 2026
- EU Data Center — docs, checked 23 September 2026
- USA Data Center — docs, checked 23 September 2026
- Australian Data Center — docs, checked 23 September 2026
- Verify Your Data Center Location — docs, checked 23 September 2026
- SMTP2GO pricing — pricing, checked 24 September 2026
- Billing, Pricing and Plans FAQ — docs, checked 24 September 2026
- Subscription Plan Differences Explained — docs, checked 24 September 2026
- Email Overage — docs, checked 23 September 2026
- Free Plan — docs, checked 24 September 2026
- Payment Options — docs, checked 23 September 2026
- VAT/GST Charged On Purchases — docs, checked 23 September 2026
- Non-profit Discount — docs, checked 23 September 2026
- When To Use A Dedicated IP Address — docs, checked 23 September 2026
- Email Archiving — docs, checked 23 September 2026
- Activity Storage Duration — docs, checked 24 September 2026
- SMS Messaging Overview — docs, checked 24 September 2026
- SMS Messaging Character Limits — docs, checked 23 September 2026
- How to Apply for a Dedicated SMS Phone Number (U.S.) — docs, checked 23 September 2026
- Send SMS (API reference) — docs, checked 24 September 2026
- Transactional SMS: Examples, Rules, and How to Send It (2026) — blog, checked 24 September 2026
- SMTP2GO developer docs llms.txt — docs, checked 23 September 2026
- Getting Started with the API — docs, checked 23 September 2026
- Authentication (API reference) — docs, checked 23 September 2026
- General API Resources (regional base URLs, response codes) — docs, checked 23 September 2026
- API changelog — changelog, checked 24 September 2026
- API Features Overview — docs, checked 23 September 2026
- Send a standard email (API reference) — docs, checked 24 September 2026
- Add a new API key (API reference) — docs, checked 23 September 2026
- SMTP Relay — docs, checked 23 September 2026
- Getting started with Templates — docs, checked 23 September 2026
- API Templates — docs, checked 23 September 2026
- Webhooks Overview — docs, checked 24 September 2026
- Setup a Webhook — docs, checked 23 September 2026
- Webhooks (help article) — docs, checked 24 September 2026
- Rate Limiting (and new-account limits) — docs, checked 23 September 2026
- Official Libraries — docs, checked 23 September 2026
- smtp2go-oss GitHub organization — repo, checked 23 September 2026
- Sandbox Mode — docs, checked 23 September 2026
- API Keys — docs, checked 23 September 2026
- Suppressions — docs, checked 23 September 2026
- Maximum Attachment Size — docs, checked 24 September 2026
- New Account Limits and the Review Process — docs, checked 23 September 2026
- Setting up WooCommerce with SMTP2GO — docs, checked 23 September 2026
- SMTP2GO MCP — docs, checked 24 September 2026
- SMTP2GO Agent Skills — docs, checked 23 September 2026
- smtp2go-oss/skills — repo, checked 23 September 2026
- Official MCP Registry search for "smtp2go" — registry, checked 24 September 2026
- Claude connector directory (SMTP2GO) — marketplace, checked 23 September 2026
- Lovable documentation index (llms.txt) — platform-docs, checked 23 September 2026
- Connect a custom MCP server as a chat connector — platform-docs, checked 23 September 2026
- Replit Agent integrations overview — platform-docs, checked 23 September 2026