MailMonitor vs Postmark
MailMonitor
mailmonitor.com
Postmark
postmarkapp.comSide by side
| Figure | MailMonitor | Postmark |
|---|---|---|
| Price from | $83.33/mo | $5/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 3 | 8 |
| Spec score · Email Deliverability Software | 8.0 (#14) | 8.7 (#6) |
| Founded | 2010 | 2010 |
| Integrations | MailMonitor says it works with all email service providers, naming Mailchimp, Sendgrid, Marketo, HubSpot, and Klaviyo. | Official integrations include Slack, Zapier, Stripe, WordPress, Supabase, Bubble, Craft CMS, Netlify, and Gravity Forms. |
| Security | The API uses HTTP Basic authentication over SSL and is not available over unencrypted HTTP. | Postmark supports TLS and HTTPS, DKIM, SPF, DMARC, two-factor authentication, API permission controls, penetration testing, and DDoS protection. |
| Support | Foundation includes analytics assistance by ticket, Strategic Partnership includes priority support access, and Enterprise includes chat communication with the team. | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. |
| What it does | MailMonitor is an email deliverability software application with diagnostic tools and hands-on services to help emails reach inboxes. | Postmark delivers and tracks application email as a replacement for SMTP or Sendmail. |
Plans
MailMonitor
- The Deliverability Foundation$1,000 a year
- The Strategic Partnership$2,000 a year
- Custom Enterprise Solution$3,000 a year
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
MailMonitor
MailMonitor has no write-up on Specifiction yet; its figures are above.
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.