Mailchimp vs Postmark
Mailchimp
mailchimp.com
Postmark
postmarkapp.comSide by side
| Figure | Mailchimp | Postmark |
|---|---|---|
| Price from | $13/mo | $5/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Plans published | 5 | 8 |
| Spec score · Transactional Email Software | 9.2 (#2) | 8.7 (#7) |
| Spec score · Email Analytics | 9.1 (#1) | 8.6 (#3) |
| Spec score · Transactional email services | 8.8 (#8) | 9.2 (#1) |
| Company history | Mailchimp was founded in Atlanta in 2001 by Ben Chestnut and Dan Kurzius. | Postmark says it has delivered billions of emails since 2010. |
| Founded | 2001 | 2010 |
| Free plan | Yes | Yes |
| Integrations | Mailchimp advertises more than 300 integrations, including Shopify, WooCommerce, Canva, Zapier, Salesforce, WordPress, Stripe and QuickBooks Online. | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. |
| Monthly send limit | 5000 | 10000 |
| Security | Mailchimp says its SOC 2 reports cover security, availability and processing integrity, and it maintains ISO 27001 certification and a VPAT. | Postmark supports TLS and HTTPS, DKIM, SPF, DMARC, two-factor authentication, API permission controls, penetration testing, and DDoS protection. |
| Support | Official feature pages state 24/7 service and support, with onboarding specialists and customer-success services for paid customers. | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. |
| What it does | Mailchimp is an email and marketing-automation platform for growing businesses, combining email, social, landing pages, advertising and AI recommendations. | Postmark delivers and tracks application email as a replacement for SMTP or Sendmail. |
Plans
Mailchimp
- FreeFree
- FreeFree
- Essentials$13 a month
- Standard$20 a month
- Premium$350 a month
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
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.