Postmark vs turboSMTP
Postmark
postmarkapp.comturboSMTP
turbosmtp.comSide by side
| Figure | Postmark | turboSMTP |
|---|---|---|
| Price from | $5/mo | €14.95/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 8 | 18 |
| Spec score · Transactional email services | 9.2 (#1) | 9.1 (#3) |
| Spec score · Transactional Email Software | 8.7 (#7) | 8.7 (#8) |
| Spec score · Email APIs | 8.6 (#6) | 8.7 (#3) |
| Dedicated IP option | Yes | Yes |
| Founded | 2010 | 2009 |
| Free plan | Yes | No |
| Integrations | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. | A Zapier app launched with Send Email and Find Email Status actions for connecting CRMs, forms, spreadsheets and other Zapier applications. |
| Monthly send limit | 10000 | 15000 |
| Security | Postmark supports TLS and HTTPS, DKIM, SPF, DMARC, two-factor authentication, API permission controls, penetration testing, and DDoS protection. | Pricing lists SPF/DKIM authentication, API keys, custom sending domains with SPF/DKIM/DMARC, and two-factor authentication as security and compliance features. |
| Support | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. | The company states that ticket, live-chat and phone support are available around the clock and handled by human staff. |
| Tracking | Postmark provides delivery, bounce, spam, open, and link tracking plus event webhooks. | The platform provides real-time delivery, open and click reporting and supports custom tracking domains. |
| What it does | Postmark delivers and tracks application email as a replacement for SMTP or Sendmail. | turboSMTP provides hosted SMTP relay and API infrastructure for transactional, marketing and newsletter email delivery. |
Plans
Postmark
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
- Dedicated IP$50 a month
- High-volume plansPriced on request
turboSMTP
- FreeFree
- Basic€14.95 a month
- Pro€79.95 a month
- Silver€49 a month
- Gold€92 a month
- Resell€270 a month
- Titanium€450 a month
- Diamond€790 a month
- FREEFree
- BASIC€14.95 a month
In their own words
Postmark
Postmark delivers and tracks application email as an alternative to SMTP or Sendmail. It separates transactional and broadcast messages into different Message Streams and IP infrastructure. Developers can send through REST API, SMTP, or multi-region SMTP routing, with official libraries for Node.js, Python, Rails, Ruby, PHP, and.NET. Inbound messages can be converted to JSON and sent to a webhook URL. Tracking includes delivery, bounces, spam, opens, and links, with event webhooks. Editable responsive templates cover transactional messages such as password resets, receipts, and invitations. The free Developer plan costs nothing, provides 100 emails per month, permits no overages, and does not expire. Basic starts at $15 a month for 10,000 emails per month; extra emails cost $1.80 per 1,000 and are calculated at the end of the billing cycle. Unused emails do not roll over. Postmark lists API and web access. Its iOS app was sunset in June 2025 and is no longer supported.
turboSMTP
turboSMTP is a cloud SMTP service for sending email messages and newsletters, with statistical analysis for individual and aggregate messages. Its SMTP API supports transactional messages such as login confirmations, welcome messages, and receipts from a website or app. The dashboard tracks clicks and opens in real time, while listed tools manage bounces, spam, and unsubscribes. Deliverability features include smart routing, custom tracking domains, and email validation before campaigns. An email marketing tool can design, send, and track campaigns using turboSMTP delivery infrastructure. The service lists SMTP relay, email templates, delivery event webhooks, and a dedicated IP option; inbound email is not supported. It offers a free plan allowing 200 emails per day for the first six months. Basic costs €14.95 a month for 15,000 emails per month; Pro costs €79.95 a month for the same send limit and up to 100 subaccounts. Other listed plans sell email credits, which expire one year after purchase. Platforms include Android, API, iOS, and web. The maker advertises 24/7 multilingual support by phone, chat, and email.