Email APIs · side by side
Mails.ai vs Resend
Compare Mails.ai, Resend by sending volume, delivery webhooks, inbound email, domain limits and retention.
Email APIs pricing calculator
These providers bill in different units. Each estimate uses its own workload; there is no same-volume price winner.
Mails.ai
0
Resend
100K
Mails.ai
$0 / mo
Free · 0 sends
Resend
$90 / mo
Scale · 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 | Mails.ai | Resend |
|---|---|---|
| Provider | Mails.ai | Resend |
| Billing unit | sends | emails |
| Plan at selected usage | Free | Scale |
| Monthly estimate | $0/mo | $90/mo |
| Workload | 0 sends | 100K emails |
| Free access | 3,000 events/month, 1 agent, sending via workspace subdomain, MCP server access, and SDKs with no credit card required | 3,000 emails/mo |
| Published plans | Free, Pro, Scale | Free, Pro, Scale, Enterprise |
| Prices checked | 2026-10-08 | 2026-10-08 |
Provider
- Mails.ai
- Mails.ai
- Resend
- Resend
Billing unit
- Mails.ai
- sends
- Resend
- emails
Plan at selected usage
- Mails.ai
- Free
- Resend
- Scale
Monthly estimate
- Mails.ai
- $0/mo
- Resend
- $90/mo
Workload
- Mails.ai
- 0 sends
- Resend
- 100K emails
Free access
- Mails.ai
- 3,000 events/month, 1 agent, sending via workspace subdomain, MCP server access, and SDKs with no credit card required
- Resend
- 3,000 emails/mo
Published plans
- Mails.ai
- Free, Pro, Scale
- Resend
- Free, Pro, Scale, Enterprise
Prices checked
- Mails.ai
- 2026-10-08
- Resend
- 2026-10-08
Email APIs monthly cost
Mails.ai: $0Resend: $90
Different workloads, separate estimates
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.
Email APIs feature comparison
| Email APIs | Mails.ai | Resend |
|---|---|---|
| Single sign-on | Not listed | With add-on |
| Daily limit | Not listed | No limit |
| Inbound emails | Not listed | |
| RESTful API | Not listed | |
| SMTP relay | Not listed | |
| Official SDKs | Not listed | |
| Schedule emails | Not listed | |
| Batch sending | Not listed | |
| Open tracking | Not listed | |
| Link tracking | Not listed | |
| React Email | Not listed | |
| Custom domains | Not listed | 1,000 |
| Additional domains | Not listed | With add-on |
| Dedicated IPs | Not listed | With add-on |
| Dedicated IP warming | Not listed | |
| Pristine shared IPs | Not listed | |
| Automatic suppression list | Not listed | |
| Bounce details | Not listed | |
| Multi-region | Not listed | |
| Data retention | Not listed | 30 days |
| Deliverability insights | Not listed | |
| DKIM, SPF, DMARC authentication | Not listed | |
| Webhook endpoints | Not listed | 10 endpoints |
| Webhook events | Not listed | All events |
| Social login | Not listed | |
| GDPR compliance | Not listed | |
| SOC 2 Type II certification | Not listed | |
| Penetration testing | Not listed | |
| DDoS protection | Not listed | |
| Automated backups | Not listed | |
| Multi-factor authentication | Not listed | |
| API key permissions | Not listed | |
| Signed webhook endpoints | Not listed | |
| Ticket support | Not listed | |
| Slack support | Not listed | |
| Urgent response SLA | Not listed | |
| Deliverability expertise | Not listed | |
| In-app documentation | Not listed | |
| AI assistant | Not listed | |
| AI credits / mo | Not listed | 500 |
Single sign-on
- Mails.ai
- Not listed
- Resend
- With add-on
Daily limit
- Mails.ai
- Not listed
- Resend
- No limit
Inbound emails
- Mails.ai
- Not listed
- Resend
RESTful API
- Mails.ai
- Not listed
- Resend
SMTP relay
- Mails.ai
- Not listed
- Resend
Official SDKs
- Mails.ai
- Not listed
- Resend
Schedule emails
- Mails.ai
- Not listed
- Resend
Batch sending
- Mails.ai
- Not listed
- Resend
Open tracking
- Mails.ai
- Not listed
- Resend
Link tracking
- Mails.ai
- Not listed
- Resend
React Email
- Mails.ai
- Not listed
- Resend
Custom domains
- Mails.ai
- Not listed
- Resend
- 1,000
Additional domains
- Mails.ai
- Not listed
- Resend
- With add-on
Dedicated IPs
- Mails.ai
- Not listed
- Resend
- With add-on
Dedicated IP warming
- Mails.ai
- Not listed
- Resend
Pristine shared IPs
- Mails.ai
- Not listed
- Resend
Automatic suppression list
- Mails.ai
- Not listed
- Resend
Bounce details
- Mails.ai
- Not listed
- Resend
Multi-region
- Mails.ai
- Not listed
- Resend
Data retention
- Mails.ai
- Not listed
- Resend
- 30 days
Deliverability insights
- Mails.ai
- Not listed
- Resend
DKIM, SPF, DMARC authentication
- Mails.ai
- Not listed
- Resend
Webhook endpoints
- Mails.ai
- Not listed
- Resend
- 10 endpoints
Webhook events
- Mails.ai
- Not listed
- Resend
- All events
Social login
- Mails.ai
- Not listed
- Resend
GDPR compliance
- Mails.ai
- Not listed
- Resend
SOC 2 Type II certification
- Mails.ai
- Not listed
- Resend
Penetration testing
- Mails.ai
- Not listed
- Resend
DDoS protection
- Mails.ai
- Not listed
- Resend
Automated backups
- Mails.ai
- Not listed
- Resend
Multi-factor authentication
- Mails.ai
- Not listed
- Resend
API key permissions
- Mails.ai
- Not listed
- Resend
Signed webhook endpoints
- Mails.ai
- Not listed
- Resend
Ticket support
- Mails.ai
- Not listed
- Resend
Slack support
- Mails.ai
- Not listed
- Resend
Urgent response SLA
- Mails.ai
- Not listed
- Resend
Deliverability expertise
- Mails.ai
- Not listed
- Resend
In-app documentation
- Mails.ai
- Not listed
- Resend
AI assistant
- Mails.ai
- Not listed
- Resend
AI credits / mo
- Mails.ai
- Not listed
- Resend
- 500
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Which email providers fit your needs?
Mails.ai features & plan notes
- Inbound email parsing delivered as structured JSON with automatic prompt-injection detection
- Automatic email thread reconstruction and conversation handling via REST, SSE, or webhooks
- Native Model Context Protocol (MCP) server support alongside TypeScript and Python SDKs
- Per-agent reputation monitoring and send limits with cold outreach enforcement
- 3,000 events / month
- 1 agent
- TypeScript + Python SDKs, REST
- MCP server
- Magic-link signup, no card
Resend features & plan notes
- React Email
- Simple API
- Webhooks
- All Pro features
- 1,000 domains
- Dedicated Slack channel
- 10 webhook endpoints
- 500 AI credits / mo
- SSO with add-on
- Dedicated IP with add-on
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