Email APIs · side by side
Mailtrap vs Postmark
Compare Mailtrap, Postmark by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
100K
Mailtrap
$85 / mo
Email API/SMTP - Business · 100K emails
Postmark
$126 / mo
Platform · 100K emails
Listed USD plan fees and tracked usage only. Unlisted compute, transfer, extras, taxes and contract terms are excluded. Custom or unsupported plan usage is not estimated.
Email APIs overview & pricing
| Email APIs | Mailtrap | Postmark |
|---|---|---|
| Provider | Railsware | ActiveCampaign |
| Billing unit | emails | emails |
| Plan at selected usage | Email API/SMTP - Business | Platform |
| Monthly estimate | $85/mo | $126/mo |
| Workload | 100K emails | 100K emails |
| Free access | Limited free plan | 100 emails/mo |
| Published plans | Email API/SMTP - Free, Email Sandbox - Free, Email Marketing - Free, Email API/SMTP - Basic, Email Marketing - Essential, Email Sandbox - Basic, Email Sandbox - Team, Email Marketing - Pro, Email API/SMTP - Business, Email Sandbox - Business, Email Sandbox - Enterprise, Email API/SMTP - Enterprise | Free, Basic, Pro, Platform |
| Prices checked | 2026-10-08 | Not listed |
Provider
- Mailtrap
- Railsware
- Postmark
- ActiveCampaign
Billing unit
- Mailtrap
- emails
- Postmark
- emails
Plan at selected usage
- Mailtrap
- Email API/SMTP - Business
- Postmark
- Platform
Monthly estimate
- Mailtrap
- $85/mo
- Postmark
- $126/mo
Workload
- Mailtrap
- 100K emails
- Postmark
- 100K emails
Free access
- Mailtrap
- Limited free plan
- Postmark
- 100 emails/mo
Published plans
- Mailtrap
- Email API/SMTP - Free, Email Sandbox - Free, Email Marketing - Free, Email API/SMTP - Basic, Email Marketing - Essential, Email Sandbox - Basic, Email Sandbox - Team, Email Marketing - Pro, Email API/SMTP - Business, Email Sandbox - Business, Email Sandbox - Enterprise, Email API/SMTP - Enterprise
- Postmark
- Free, Basic, Pro, Platform
Prices checked
- Mailtrap
- 2026-10-08
- Postmark
- Not listed
Email APIs monthly cost
Mailtrap: $85Postmark: $126
Cost by emails
Cost curve data
| emails | Mailtrap | Postmark |
|---|---|---|
| 0 | $498 | $0 |
| 25K | $15 | $36 |
| 50K | $123 | $66 |
| 100K | $85 | $126 |
| 200K | $750 | $246 |
| 500K | $750 | $606 |
| 1M | $750 | $1,206 |
0
- Mailtrap
- $498
- Postmark
- $0
25K
- Mailtrap
- $15
- Postmark
- $36
50K
- Mailtrap
- $123
- Postmark
- $66
100K
- Mailtrap
- $85
- Postmark
- $126
200K
- Mailtrap
- $750
- Postmark
- $246
500K
- Mailtrap
- $750
- Postmark
- $606
1M
- Mailtrap
- $750
- Postmark
- $1,206
Email APIs feature comparison
| Email APIs | Mailtrap | Postmark |
|---|---|---|
| Sending methods | Not listed | Not listed |
| Inbound processing | Not listed | Not listed |
| Sending domains | Not listed | Not listed |
| Activity retention | Not listed | Not listed |
| Webhooks & events | Not listed | Not listed |
| Dedicated IP | Not listed | Not listed |
| Single sign-on | Not listed | Not listed |
| Support | Not listed | Not listed |
| Emails/day | Not listed | Not listed |
| Emails/month | Not listed | Not listed |
| Domains | Not listed | Not listed |
| Extra emails (cost per 1,000) | Not listed | Not listed |
| API and SMTP relay | Not listed | Not listed |
| Inbound email | Not listed | Not listed |
| Email log retention (days) | Not listed | Not listed |
| Email body retention (days) | Not listed | Not listed |
| Webhooks | Not listed | Not listed |
| Templates | Not listed | Not listed |
| Auto BCC | Not listed | Not listed |
| Bulk stream | Not listed | Not listed |
| API access | Not listed | Not listed |
| SDKs | Not listed | Not listed |
| Max email size | Not listed | Not listed |
| SPF, DKIM, DMARC | Not listed | Not listed |
| Auto warm-up | Not listed | Not listed |
| Email throttling | Not listed | Not listed |
| Suppressions management | Not listed | Not listed |
| Reputation monitoring | Not listed | Not listed |
| Bounce categorization | Not listed | Not listed |
| ISP feedback loop data | Not listed | Not listed |
| SaaS safeguard | Not listed | Not listed |
| Open rate tracking | Not listed | Not listed |
| Click rate tracking | Not listed | Not listed |
| Deliverability analytics | Not listed | Not listed |
| Separate stats for each mailbox provider | Not listed | Not listed |
| HTTPS link branding | Not listed | Not listed |
| User management | Not listed | Not listed |
| Users | Not listed | Not listed |
| 2FA | Not listed | Not listed |
| SSO | Not listed | Not listed |
| Organization & Sub-accounts | Not listed | Not listed |
| Audit logs | Not listed | Not listed |
| GDPR compliance | Not listed | Not listed |
| ISO 27001 | Not listed | Not listed |
| SOC 2 Type 2 | Not listed | Not listed |
| API key permissions | Not listed | Not listed |
| IP whitelisting | Not listed | Not listed |
| Content-free logging | Not listed | Not listed |
| Support options | Not listed | Not listed |
| Support availability | Not listed | Not listed |
| Priority support | Not listed | Not listed |
| Deliverability expert assistance | Not listed | Not listed |
| Migration assistance | Not listed | Not listed |
Sending methods
- Mailtrap
- Not listed
- Postmark
- Not listed
Inbound processing
- Mailtrap
- Not listed
- Postmark
- Not listed
Sending domains
- Mailtrap
- Not listed
- Postmark
- Not listed
Activity retention
- Mailtrap
- Not listed
- Postmark
- Not listed
Webhooks & events
- Mailtrap
- Not listed
- Postmark
- Not listed
Dedicated IP
- Mailtrap
- Not listed
- Postmark
- Not listed
Single sign-on
- Mailtrap
- Not listed
- Postmark
- Not listed
Support
- Mailtrap
- Not listed
- Postmark
- Not listed
Emails/day
- Mailtrap
- Not listed
- Postmark
- Not listed
Emails/month
- Mailtrap
- Not listed
- Postmark
- Not listed
Domains
- Mailtrap
- Not listed
- Postmark
- Not listed
Extra emails (cost per 1,000)
- Mailtrap
- Not listed
- Postmark
- Not listed
API and SMTP relay
- Mailtrap
- Not listed
- Postmark
- Not listed
Inbound email
- Mailtrap
- Not listed
- Postmark
- Not listed
Email log retention (days)
- Mailtrap
- Not listed
- Postmark
- Not listed
Email body retention (days)
- Mailtrap
- Not listed
- Postmark
- Not listed
Webhooks
- Mailtrap
- Not listed
- Postmark
- Not listed
Templates
- Mailtrap
- Not listed
- Postmark
- Not listed
Auto BCC
- Mailtrap
- Not listed
- Postmark
- Not listed
Bulk stream
- Mailtrap
- Not listed
- Postmark
- Not listed
API access
- Mailtrap
- Not listed
- Postmark
- Not listed
SDKs
- Mailtrap
- Not listed
- Postmark
- Not listed
Max email size
- Mailtrap
- Not listed
- Postmark
- Not listed
SPF, DKIM, DMARC
- Mailtrap
- Not listed
- Postmark
- Not listed
Auto warm-up
- Mailtrap
- Not listed
- Postmark
- Not listed
Email throttling
- Mailtrap
- Not listed
- Postmark
- Not listed
Suppressions management
- Mailtrap
- Not listed
- Postmark
- Not listed
Reputation monitoring
- Mailtrap
- Not listed
- Postmark
- Not listed
Bounce categorization
- Mailtrap
- Not listed
- Postmark
- Not listed
ISP feedback loop data
- Mailtrap
- Not listed
- Postmark
- Not listed
SaaS safeguard
- Mailtrap
- Not listed
- Postmark
- Not listed
Open rate tracking
- Mailtrap
- Not listed
- Postmark
- Not listed
Click rate tracking
- Mailtrap
- Not listed
- Postmark
- Not listed
Deliverability analytics
- Mailtrap
- Not listed
- Postmark
- Not listed
Separate stats for each mailbox provider
- Mailtrap
- Not listed
- Postmark
- Not listed
HTTPS link branding
- Mailtrap
- Not listed
- Postmark
- Not listed
User management
- Mailtrap
- Not listed
- Postmark
- Not listed
Users
- Mailtrap
- Not listed
- Postmark
- Not listed
2FA
- Mailtrap
- Not listed
- Postmark
- Not listed
SSO
- Mailtrap
- Not listed
- Postmark
- Not listed
Organization & Sub-accounts
- Mailtrap
- Not listed
- Postmark
- Not listed
Audit logs
- Mailtrap
- Not listed
- Postmark
- Not listed
GDPR compliance
- Mailtrap
- Not listed
- Postmark
- Not listed
ISO 27001
- Mailtrap
- Not listed
- Postmark
- Not listed
SOC 2 Type 2
- Mailtrap
- Not listed
- Postmark
- Not listed
API key permissions
- Mailtrap
- Not listed
- Postmark
- Not listed
IP whitelisting
- Mailtrap
- Not listed
- Postmark
- Not listed
Content-free logging
- Mailtrap
- Not listed
- Postmark
- Not listed
Support options
- Mailtrap
- Not listed
- Postmark
- Not listed
Support availability
- Mailtrap
- Not listed
- Postmark
- Not listed
Priority support
- Mailtrap
- Not listed
- Postmark
- Not listed
Deliverability expert assistance
- Mailtrap
- Not listed
- Postmark
- Not listed
Migration assistance
- Mailtrap
- Not listed
- Postmark
- Not listed
Showing 15 of 53
Which email providers fit your needs?
Mailtrap features & plan notes
- Email sandbox
- Sending API
- Detailed logs
- 100,000 emails ($85/mo), 250,000 emails ($200/mo), 500,000 emails ($300/mo), or 750,000 emails ($450/mo)
- 100 users
- 15 days of email logs
- 100 domains
- Dedicated IP
- Extra emails: $0,88 per 1,000
How to compare email providers
Separate transactional delivery from campaigns, outreach and agent inboxes. Compare monthly sends and daily caps; contacts, seats and inboxes are not sending allowances. Budget separately for dedicated IPs, validation and attachments.
Browse Email APIs pricing