---
title: "Features - Enterprise SMTP Relay | OutboundSMTP"
description: "Dedicated IPs, sub-account management, advanced authentication, RESTful API, real-time analytics, and white-glove support. Everything you need for enterprise email delivery."
image: "https://outboundsmtp.com/images/og-default.png"
canonical: "https://outboundsmtp.com/features/"
---

# Enterprise Email Delivery, Fully Loaded 

From dedicated IPs to white-glove support, OutboundSMTP gives you complete control over your email infrastructure.

[ Try 1,000 Free Credits → ](https://insight.iljmp.com/4/smtp-free) [ Schedule a Demo ](/contact-us/) 

Core Infrastructure 

## Built for reliability and performance

Multi-region infrastructure with dedicated IP addresses, custom PTR records, and sub-account isolation. Your emails arrive on time, every time.

- Dedicated IPs with automated warming schedules
- Sub-accounts with separate API keys and sending limits
- Custom PTR records and MAIL FROM domains
- Multi-region failover for guaranteed delivery

99.9%

Uptime SLA

<1s

Delivery

5

Regions

24/7

Monitoring

#### Authentication Status

DKIM Signed RSA-2048, selector: os1 

SPF Aligned include:spf.outboundsmtp.com 

DMARC Pass p=reject, rua configured 

TLS 1.3 AES-256-GCM encrypted 

Security & Authentication 

## Enterprise-grade email security

Full authentication suite managed for you. DKIM signing, SPF alignment, and DMARC compliance — configured by our delivery experts during onboarding.

[Authentication details → ](/features/authentication/) [Security & compliance → ](/features/security/) 

Developer Tools 

## Integrate in minutes, not days

Standard SMTP relay or RESTful API — your choice. Comprehensive docs, SDKs, and a sandbox for testing.

[ RESTful APIFull-featured email API with SDKs for Python, Node.js, Ruby, Go, and PHP. Sandbox environment for testing. ](/features/api/)

### SMTP Relay

Standard SMTP with TLS 1.2+ encryption. Drop-in replacement for any existing SMTP configuration.

### Event Notifications

Real-time webhooks for delivery, bounce, open, click, and complaint events.

### Delivery Logs & Tracking

Comprehensive logs with search and filtering. Track every email from submission to inbox with detailed event history.

### Real-time Analytics

Dashboards with delivery rates, bounce analysis, engagement metrics, and trend reporting across all sub-accounts.

White-Glove Support 

## Expert support, not chatbots

Direct access to email delivery experts who understand the nuances of enterprise email infrastructure. We help you succeed from day one.

- Custom DKIM, SPF, DMARC implementation
- Dedicated IP warming and reputation management
- Proactive deliverability monitoring and alerts
- Strategic consulting on sending practices

#### Support Response Times

Enterprise <1 hour 24/7/365 

Professional <4 hours Mon-Fri 

Starter <24 hours Mon-Fri 

Compliance 

## Built for regulated industries

SOC 2 Type II Certified 

GDPR EU Compliant 

HIPAA BAA Available 

PCI DSS Compliant 

CCPA California Compliant 

DPA On Request 

SSO SAML 2.0 

RBAC Role-Based Access 

Explore All Features 

## Dive deeper into our capabilities

[ Dedicated IPs ](/features/delivery/)[ IP Piggybacking ](/features/ip-piggybacking/)[ Sub-Accounts ](/features/subaccounts/)[ Custom MAIL FROM ](/features/custom-mail-from/)[ DNS Management ](/features/dns/)[ Customization ](/features/customization/) 

 40K+ 

 Businesses 

 99.9% 

 Uptime SLA 

 <1s 

 Delivery 

 SOC 2 

 Certified 

## Ready to start sending?

Get 1,000 free email credits. No credit card required.

[Try 1,000 Free Credits→](https://insight.iljmp.com/4/smtp-free)[Schedule a Demo](/contact-us/)

```json
{"@context":"https://schema.org","@type":"Organization","name":"OutboundSMTP","url":"https://outboundsmtp.com","logo":{"@type":"ImageObject","url":"https://outboundsmtp.com/images/outboundsmtp-logo.png"},"description":"Enterprise SMTP relay service by DuoCircle. Dedicated IPs, sub-accounts, full authentication, and reliable email delivery for businesses of all sizes.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]},"sameAs":["https://www.linkedin.com/company/duocircle","https://www.facebook.com/duocircle/","https://x.com/duocircle","https://github.com/duocircle"],"aggregateRating":{"@type":"AggregateRating","ratingValue":"4.7","reviewCount":"15","bestRating":"5","worstRating":"1","url":"https://www.g2.com/products/outbound-smtp/reviews"},"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://outboundsmtp.com/contact-us/"},"knowsAbout":["SMTP Relay","Email Delivery","Email Infrastructure","Dedicated IP Addresses","Email Authentication","SPF","DKIM","DMARC","Transactional Email","Outbound Email"]}
```

```json
{"@context":"https://schema.org","@type":"WebSite","name":"OutboundSMTP","url":"https://outboundsmtp.com","description":"Enterprise SMTP relay service by DuoCircle. Dedicated IPs, sub-accounts, full authentication, and reliable email delivery for businesses of all sizes.","publisher":{"@type":"Organization","name":"OutboundSMTP","url":"https://outboundsmtp.com","logo":{"@type":"ImageObject","url":"https://outboundsmtp.com/images/outboundsmtp-logo.png"},"description":"Enterprise SMTP relay service by DuoCircle. Dedicated IPs, sub-accounts, full authentication, and reliable email delivery for businesses of all sizes.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}}}
```