Enterprise SMTP Relay Built for Complex Requirements
When other providers focus only on volume, we excel at delivering specialized solutions for your unique email challenges.
- Dedicated IPs with warming assistance
- Sub-second delivery, 99.9% uptime SLA
- DKIM, SPF & DMARC fully managed
- White-glove setup by delivery experts
# SMTP Configuration
SMTP_HOST=smtp.outboundsmtp.com
SMTP_PORT=587
SMTP_USER=your-api-key
SMTP_TLS=required
# Or use the API
curl -X POST \
https://api.outbound.mailhop.org/v1/send \
-H "Authorization: Bearer API_KEY" \
-H "Content-Type: application/json" \
-d '{"to":"user@example.com"}'Trusted across industries
What Makes an Enterprise SMTP Relay Reliable?
Dedicated IPs
Full control over your sending reputation with dedicated IP addresses. IP warming assistance and custom PTR records included.
Sub-Account Management
Manage multiple applications with separate API keys, individual usage tracking, and custom sending limits per sub-account.
Advanced Authentication
Automatic DKIM signing, SPF record management, and DMARC alignment support. Custom MAIL FROM domains for full control.
High Performance
99.9% uptime SLA with sub-second delivery times. Multi-region infrastructure ensures your emails arrive on time, every time.
Real-time Analytics
Comprehensive delivery reports, bounce handling, and event notifications. See exactly what happens to every email you send.
White-Glove Support
Direct access to delivery experts. Custom implementation assistance, proactive account monitoring, and deliverability consulting.
What Can You Send With OutboundSMTP?
OutboundSMTP handles the email infrastructure so your team can focus on what they do best.
Transactional Email
Order confirmations, password resets, receipts
Application Alerts
System notifications, monitoring alerts, logs
Marketing Campaigns
Newsletters, promotions, drip sequences
Tenant Migrations
Queuing during Office 365 / Google migrations
Delivery Dashboard
Last 24 hours
What Security Standards Does OutboundSMTP Meet?
What Else Do You Need for Email Deliverability?
Reliable email delivery requires great infrastructure, proper authentication, inbox placement monitoring, and continuous optimization. OutboundSMTP is one piece of a complete ecosystem.
OutboundSMTP
SMTP relay with dedicated IPs, sub-accounts, and white-glove support.
AuthenticationDMARC Report
AI-powered DMARC analysis, aggregate & forensic reporting, multi-domain monitoring.
AuthenticationAutoSPF
Automatic SPF flattening so you never hit the 10-lookup limit.
Coming SoonInbox Issue
Inbox placement testing and deliverability intelligence. Know where your emails actually land.
All products by DuoCircle — email security and infrastructure since 2008.
Ready to start sending?
Get 1,000 free email credits. No credit card required.
Common questions about OutboundSMTP
What is OutboundSMTP?
OutboundSMTP is an enterprise SMTP relay service built for complex email requirements. Unlike high-volume-only providers, we specialize in dedicated IP addresses, advanced authentication, sub-account management, and white-glove support for businesses that need reliable, authenticated email delivery.
What is the difference between a dedicated IP and a shared IP?
A dedicated IP gives you full control over your sending reputation, since only your emails are sent from that address. Shared IPs pool traffic from multiple senders, meaning another sender's bad practices can hurt your deliverability. OutboundSMTP includes dedicated IPs with IP warming assistance and custom PTR records on Professional and Enterprise plans.
How does OutboundSMTP handle email authentication (SPF, DKIM, DMARC)?
OutboundSMTP fully manages email authentication for you. We provide automatic DKIM signing, SPF record management, and DMARC alignment support. You can also configure custom MAIL FROM domains for complete control over your authentication chain, helping your emails pass strict inbox filtering policies.
How much does OutboundSMTP cost?
OutboundSMTP offers four plans: Free (1,000 email credits at no cost), Starter at $4/month for low-volume senders, Professional at $14/month with dedicated IPs and advanced features, and Enterprise starting at $69/month for high-volume and regulated industries with custom configurations and priority support.
How long does it take to set up OutboundSMTP?
Most customers are sending email within minutes. Point your application to smtp.outboundsmtp.com on port 587, authenticate with your API key, and you are ready to go. For dedicated IP setups, our delivery experts provide hands-on warming assistance to build your sending reputation quickly and safely.
What kind of support does OutboundSMTP provide?
OutboundSMTP provides 24/7 expert support from real email delivery specialists, not chatbots. Enterprise customers get white-glove onboarding, proactive account monitoring, deliverability consulting, and custom implementation assistance. All plans include access to our support team for technical questions and troubleshooting.