Envelope
Outbound SMTP Gateway
Distributed outbound email infrastructure that balances delivery across thousands of sending IPs, monitors reputation in real time, and keeps your mail landing in the inbox — not the spam folder.
From Source to Inbox
Every email from your hosting environment flows through Envelope's anti-spam filter and out via a distributed pool of clean sending IPs — automatically.
Deliverability, engineered.
750,000+ Emails / Day
High-throughput outbound email delivery sized for hosting providers, agencies and SaaS platforms — with headroom for peak traffic.
99.7% Delivery Success
Continuous monitoring of bounces, deferrals and inbox placement keeps the success rate consistently above 99.7% across all sending domains.
Outbound Spam Protection
Intelligent content scanning, rate limiting and reputation scoring stop compromised accounts from poisoning the wider sending pool.
2,000+ Sending IPs
Thousands of distinct outbound IPs organised into reputation pools. Mail is routed via the healthiest IPs for the destination in real time.
Real-Time Blacklist Mitigation
If any IP in the pool shows signs of reputation damage, it's quarantined automatically and your mail is rerouted through clean IPs — instantly.
Zero Configuration
Envelope is wired into every hosting plan at the platform level. Mail sent from your sites flows through Envelope automatically — no setup required.
Part of a bigger picture
Learn about the Envision Platform
Envelope is one part of Envision — our suite of next-generation infrastructure features built into your hosting. Explore the full platform.
Explore Envision →How Envelope works
Your site sends an email
Any mail dispatched from your hosting — transactional, marketing or contact form — is handed to the Envelope gateway.
Scanned & routed
Outbound spam checks run, then Envelope selects the best sending IP based on destination, volume and current reputation.
Delivered to the inbox
Mail is handed off to the recipient's server from a clean, reputable IP — maximising inbox placement and delivery success.