Enterprise-grade email infrastructure with cryptographic authenticity proofs, multi-provider failover, and real-time deliverability intelligence.
99.2%
Delivery Rate
4+
Providers
<800ms
Avg Latency
99.95%
Uptime SLA
Email delivery is a reliability problem. SendGrid goes down — your transactional emails stall. Mailgun throttles — your campaigns miss deadlines. SMSLY Email abstracts four providers behind a single REST API. Adaptive routing selects the optimal provider based on real-time latency, deliverability scores, and cost. When a provider degrades, failover is automatic — no retry logic needed on your side. Same API key, same payload format, same webhooks. Your code never changes.
Every outbound email is stamped with a cryptographic hash-chain proof — not just DKIM signatures, but a verifiable chain of authenticity that links back to your verified sender identity. Recipients verify with one click. Unstamped emails from stamped senders trigger fraud warnings. This is the difference between "probably real" and "cryptographically proven." BEC attacks, CEO fraud, and domain spoofing become mathematically impossible against your brand.
Inbox placement varies by ISP, time of day, content, and sender reputation. SMSLY tracks delivery outcomes across 50+ ISPs in real time. Spam score testing runs before every campaign. IP warmup scheduling gradually increases volume to build reputation. Deliverability dashboards show per-ISP performance. When a mailbox provider changes its filtering rules, you know within hours — not weeks.
SaaS platforms need email isolation — Tenant A's reputation cannot affect Tenant B's deliverability. SMSLY Email assigns dedicated API keys, IP pools, and reputation scores per tenant. Rate limits are enforced per-tenant. Suppression lists are isolated. Webhook delivery is per-tenant. One platform, thousands of isolated email environments. Your customers never see each other's data, reputation, or throughput.
Most email platforms only handle outbound. SMSLY parses inbound email via IMAP, extracts RFC822 content, and routes to your webhooks. Attachments are decoded and stored. Routing rules match on sender, subject, headers, or content. Build automated response systems, ticket creation flows, and compliance pipelines — all triggered by incoming email without polling.
Every feature designed for reliability at scale. No compromises.
Automatic failover across SMTP, SendGrid, Mailgun, and SES. If one provider degrades, the next takes over in under 200ms — delivery never stops.
Every outbound email gets a cryptographic hash-chain proof. Recipients verify authenticity with one click. Stops BEC, CEO fraud, and spoofing at the protocol level.
Full authentication suite with automatic key rotation. Guided DNS setup wizard gets your domain verified in under 5 minutes.
Real-time inbox placement tracking across Gmail, Outlook, Yahoo, and 50+ ISPs. Spam score testing before every campaign. IP warmup scheduling built in.
Handlebars-powered templates with dynamic variables, conditional blocks, and HTML/text dual rendering. Lock templates to prevent unauthorized modifications.
Delivery, open, click, bounce, and complaint events pushed to your endpoint instantly. HMAC-signed payloads. Exponential backoff retries with dead-letter replay.
IMAP integration with automatic RFC822 parsing. Route inbound emails to webhooks, extract attachments, and trigger automated response flows.
Automatic hard bounce and complaint suppression. Import/export lists. Global suppression database prevents re-sending to problematic addresses.
Per-tenant API keys, rate limits, and deliverability isolation. Each tenant gets dedicated IP pools and reputation tracking. One platform, zero cross-tenant contamination.
Split test subject lines, content, and send times. Auto-select winning variants based on open/click rates. Statistical significance calculations built in.
Drop-in SDKs for every major language. One API call to get started.
Password resets, order confirmations, shipping notifications, and receipt delivery with guaranteed inbox placement and sub-second latency.
Newsletters, product announcements, and promotional campaigns with dynamic content blocks, A/B testing, and send-time optimization.
MIP-stamped emails let recipients verify that executive communications are authentic. Prevents CEO fraud, wire transfer scams, and domain spoofing.
Multi-tenant notification systems with per-tenant templates, rate limiting, and deliverability isolation. One API, thousands of tenants.
Cryptographic email proofs for SOC 2, HIPAA, and GDPR audits. Every email gets a tamper-evident record with timestamp and delivery proof.
Parse inbound emails, extract attachments, route to webhooks, and trigger automated response flows. Build email-driven workflows without polling.
HIPAA-compliant email delivery with encryption at rest and in transit. Patient notifications, appointment reminders, and lab results with delivery proof.
PCI-compliant email for statements, fraud alerts, and wire confirmations. Cryptographic proofs satisfy audit requirements for financial communications.
Add your sending domain and configure SPF, DKIM, and DMARC records through our guided setup wizard. Domain verification completes in under 5 minutes.
Use the REST API for full control — attachments, templates, scheduling, webhooks. Or use SMTP relay for drop-in compatibility with existing systems. Same deliverability either way.
Toggle cryptographic email stamping in your project settings. Every outbound email automatically gets a hash-chain proof. Recipients verify with one click.
Register your HTTPS endpoint for real-time delivery events. HMAC-signed payloads verify authenticity. Exponential backoff retries ensure delivery.
Point your MX records to SMSLY. Inbound emails are automatically parsed, attachments extracted, and routed to your webhooks in real-time.
Track deliverability, engagement, and reputation across ISPs in real time. Spam test before campaigns. IP warmup scheduling builds reputation automatically.
SOC 2 Compliant
Audited annually
Encryption at Rest
AES-256
99.95% Uptime SLA
Guaranteed
Multi-Region
3 regions active
Build a complete messaging stack with products designed to work together.
Start with our free tier — no credit card required. Scale to millions of messages with enterprise support, custom SLAs, and dedicated infrastructure.
Free tier includes 1,000 emails/month. No credit card required. Enterprise plans include dedicated IPs, custom SLAs, and 24/7 support.