MAILFLOW CAPABILITIES
The tools behind dependable delivery
Explore the building blocks for transactional email—from domain authentication to delivery events.
REST API Integration
01
Authenticated SMTP- One POST /api/v1/send request
- Test keys sandbox, Live keys deliver
- Idempotency keys stop double sends
02
Domain Verification- STARTTLS with AUTH PLAIN or LOGIN
- Your API key is the password
- Same rules as the REST API
03
Projects & API Keys- 2048-bit DKIM key per domain
- SPF alignment and DMARC checks
- Rechecked automatically
04
Reliable Background Delivery- Separate Test and Live environments
- Keys with scoped permissions
- IP allow-lists for Live keys
05
Bounces & Complaints- Sent by dedicated delivery workers
- Automatic retries with backoff
- Never sent twice to a recipient
06
Suppression Lists- Bounces and complaints recorded
- Feedback reports read automatically
- Affected addresses suppressed
07
Email Templates- Added from bounces and complaints
- Manage by hand or with the API
- Suppressed recipients are skipped
08
Webhooks- {{variables}} in subject and body
- Send with a template_id
- Separate Test and Live templates
09
Usage Analytics- Delivery, suppression and domain events
- Signed with HMAC-SHA256
- Retried, with a full delivery log
10
- Accepted, bounced and failed counts
- Filter by project and period
- Drill into any single message