SMTP2GO is a reliability-focused SMTP relay and email API with a long-standing free tier, popular for getting application and device email delivered with minimal fuss.
SMTP2GO Starter is $15/month for 10,000 emails. SendPing’s entry plan costs slightly less and includes 50,000 emails, 2,500 contacts, and 10 domains.
On SMTP2GO, 100k volume plus dedicated IP territory starts at $75/month. SendPing’s Pro 100k is a third of that, and Scale — with the dedicated-IP add-on — still lands well under it.
SMTP2GO moves mail; audiences, segments, campaigns, automations, A/B tests, polls, and AI template tooling are not what it does. SendPing includes all of it in every plan.
3,000 emails/month free versus 1,000 — both permanent, both card-free, but SendPing’s also includes contacts and campaign tools.
If you need a pure SMTP relay for legacy software, printers/scanners/devices, or an app you cannot modify beyond SMTP credentials, SMTP2GO is built precisely for that. SendPing is HTTPS-API-first and does not currently expose raw SMTP.
The free tier (3,000 emails/month, 100/day) needs no card — enough to verify the whole migration end to end before paying anything.
Add your sending domain and follow the guided DKIM, SPF, and DMARC setup. One-click flows exist for Cloudflare, GoDaddy, and Namecheap; verification usually completes in minutes.
Replace your current send with one HTTPS request or a typed SDK in 8 languages. Batch endpoints, idempotency keys, and scheduling are built in.
Subscribe a webhook to delivered, opened, clicked, bounced, complained, and unsubscribed events — every request is signed so you can verify the source.
Bring audiences over via CSV or the contacts API; templates port as plain HTML or rebuild in the block editor.
The send call, after the switch
curl -X POST https://www.sendping.co/api/emails \
-H "Authorization: Bearer mb_xxxxxxxx" \
-H "Content-Type: application/json" \
-d '{
"from": "Acme <hello@acme.com>",
"to": ["delivered@test.sendping.co"],
"subject": "Welcome to Acme",
"html": "<p>You are in.</p>"
}'The sending domain is taken from the address in from — there is no domain field on this endpoint. delivered@test.sendping.co is the test recipient that reports a delivered outcome without sending real mail.
| Feature | SendPing | SMTP2GO |
|---|---|---|
| Free tier | 3,000 emails/month (100/day), unlimited contacts, 1 domain — no card required | 1,000 emails/mo (200/day) |
| Entry paid plan | $14/mo — 50,000 emails, unlimited contacts, 10 domains | $15/mo — 10,000 emails (Starter) |
| 100k emails/month | $24/mo (Pro 100k) · $63/mo (Scale, 1000 domains) | Professional from $75/mo |
| Extra volume | $0.90 per 1,000 emails — credits never expire | Per-1,000 overage on subscriptions |
| Transactional + marketing in one | API sends, campaigns, automations, and audiences in every plan | Relay/API focus — no marketing suite |
| Contacts & audiences | Unlimited stored contacts on every plan | No audience management |
| Automations | Included — visual automations, 10,000 runs/month | ✗ |
| A/B testing | ✓ | ✗ |
| Inbound receiving | ✓ | On Professional plan |
| Event webhooks | Signed webhooks: delivered, opened, clicked, bounced, complained, unsubscribed | ✓ |
| Official SDKs | 8 languages + CLI | API + SMTP; limited official SDKs |
| Log retention | 30 days on every plan | 30 days activity on paid plans |
| Dedicated IP | Add-on on Scale — Custom quote | Professional plan |
| INR billing for India | ✓ | ✗ |
SMTP2GO pricing and features summarized from public pricing pages, last checked 2026-08-02. SendPing figures come from the live plan catalog.
Want the row-by-row breakdown? See the full SendPing vs SMTP2GO comparison.
No — SendPing is HTTPS-API-first (REST API, 8 SDK languages, CLI); raw SMTP relay is intentionally not exposed today. If a device or legacy app can only speak SMTP, SMTP2GO is the right tool; if your code can make an HTTPS call, the API is simpler and richer.
SendPing at every published volume: its entry plan undercuts SMTP2GO Starter while including 5× the emails, and its 100k tiers are far below SMTP2GO Professional ($75/month).
It can relay whatever you generate, but there is no campaign composer, audience management, automations, or A/B testing. SendPing includes that entire layer.
It allows 200/day (versus SendPing’s 100/day) but only 1,000/month total versus 3,000. For steady low-volume sending SendPing’s cap is 3× larger.
Replace the SMTP credentials with one HTTPS call — POST /emails with from/to/subject/html — or drop in an SDK. Verify your domain first (guided DKIM/SPF/DMARC), then re-point event webhooks.
Free tier with 3,000 emails a month — API, campaigns, automations, and webhooks included. No card required.