Activity retention
- Free
- Developer activity
- Basic
- 45 days
- Pro
- 45 days · up to 365 with add-on
- Platform
- 45 days · up to 365 with add-on
P
Email API pricing
by ActiveCampaign
Postmark pricing, plans & costs
Transactional email focused on delivery speed, message streams, and transparent activity history.
Published plans
Choose a plan to estimate
Source checked September 25, 2026
Cost calculator
Postmark monthly estimate
100,000
Pro estimate
$134/mo
Estimate excludes taxes and optional add-ons. Verify the final quote with the provider.
Plans at 100,000 emails
Lowest calculable: PlatformPostmark plan feature comparison
| Activity retention | Developer activity | 45 days | 45 days · up to 365 with add-on | 45 days · up to 365 with add-on |
|---|---|---|---|---|
| Dedicated IP | Not included | Not included | From $50/mo | From $50/mo |
| Inbound processing | Not included | Not included | Included | Included |
| Sending domains | Limited | 5 | 10 | Unlimited |
| Sending methods | REST API + SMTP | REST API + SMTP | REST API + SMTP | REST API + SMTP |
| Single sign-on | Not included | Not included | Not included | Not included |
| Support | Standard | Standard | Standard | Standard |
| Webhooks & events | Included | Included | Included | Included |
Dedicated IP
- Free
- Not included
- Basic
- Not included
- Pro
- From $50/mo
- Platform
- From $50/mo
Inbound processing
- Free
- Not included
- Basic
- Not included
- Pro
- Included
- Platform
- Included
Sending domains
- Free
- Limited
- Basic
- 5
- Pro
- 10
- Platform
- Unlimited
Sending methods
- Free
- REST API + SMTP
- Basic
- REST API + SMTP
- Pro
- REST API + SMTP
- Platform
- REST API + SMTP
Single sign-on
- Free
- Not included
- Basic
- Not included
- Pro
- Not included
- Platform
- Not included
Support
- Free
- Standard
- Basic
- Standard
- Pro
- Standard
- Platform
- Standard
Webhooks & events
- Free
- Included
- Basic
- Included
- Pro
- Included
- Platform
- Included
6 of 8
How Postmark pricing works
Postmark separates feature access from sending volume. Basic, Pro, and Platform start at 10,000 emails, with lower overage rates and broader controls on higher feature tiers.
- The Free plan does not permit overages; paid-plan overages are settled at the end of the billing cycle.
- Sent, inbound, sandbox, CC, and BCC messages each count toward usage.
- Unused monthly emails do not roll over.
Best for
Transactional delivery and troubleshooting
Teams separating transactional and broadcast streams
Apps needing long, configurable retention
Postmark add-ons and extra charges
Dedicated IP
from $50/IP/mo
Pro or Platform with at least 300,000 emails per month.
Custom retention
from $5/mo
Customize activity and message-content retention up to 365 days.
DMARC monitoring
from $14/domain/mo
Monitoring is provided through DMARC Digests.
Postmark alternatives
Postmark pricing FAQ
Pricing source: official Postmark pricing page. Checked September 25, 2026. Pricing may change.