GreenArrow Engine
Change Log
- Historic (Pre-4.200.0) Change Log
Getting Started
- GreenArrow Concepts
- Hardware Requirements
- Supported Linux Distributions
- SSH Access
- Co-Existing With Other Software
- Firewall Configuration
- Installation Guide
- Email Concepts and Terminology
- Docker
FAQs
- Know Before You Buy
- - Administration and Configuration
  - Authentication
  - Bounce Management
  - Clustering, HA, and Containerization
  - Encryption
  - Complaint FBLs
  - Installation
  - IP Warming
  - Message Submission
  - Mail Routing and Traffic Shaping
  - Pricing, Account Relationship, and Support
  - Proxy Servers
  - Queue Management
  - Reporting, Monitoring and Logging
  - Security & Access Control
  - Software Updates
  - System Requirements
  - Throughput
- Chrome Mixed Content Compatability Guide
- GreenArrow Engine and AWS
- Common Error Messages
- Message Delivery
- Modifications and Customizations
- Pausing and Dumping Queues
- Direct Database Access
- Getting Started with Email Injection
- Creating a Drop Route
- Time Zones
- First Steps After Installing
- GreenArrow Components
- Getting Started with Event Notification
- Logging SMTP Sessions in GreenArrow
- Find Message Delivery Attempt Information
- Time Synchronization Services
- Ticket Portal Guide
- Internally Created Messages
Configuration
- Configuration File
- General Settings
- Performance Tuning
- Adding a New Domain
- Adding a New IP Address
- Adding A New Whitelabeled Cloud Domain
- IPs Authorized to Relay
- License Key
- URL Domains
- Secret Constants
- Processing Events on Dedicated Servers
- Managing GreenArrow Monitor SeedList
- Proxy Protocol
- Replace Content Domain
- Link Replacements
User Management
- Two-Factor Authentication
- Users for Email Injection
Email Authentication
- DKIM
- SPF and Sender ID
- Configuring a New From Address Domain
- Email Authentication for ESPs
Injecting Mail
- SimpleMH Injection
- Raw Injection
- - Raw Injection Headers
  - PHPMailer Raw Injection Example
- Injecting Mail with HTTP Submission API
- Local Injection Options
- Message Archive
- QMQP
- QMQP Streaming Protocol
- Speed Considerations
- Obscured Email Addresses
Delivering Mail
- VirtualMTAs
- Throttling
- - Updating Throttle Settings on the Command Line
  - Updating Throttle Settings in SQL
- Dynamic Delivery
- Retry Schedule
- Internal DNS Cache
- Recipient MX Selection
- Pausing Domains
Incoming Email
- Incoming Email Domains
- Aliased Incoming Email Domains
- Bounce Mailboxes
- Spam Complaint Mailboxes
- Email Forwarders
- SMTP AUTH and POP3 Email Users
- DNSBLs and RBLs
Bounces and Spam Complaints
- Bounce Processor Concepts
- Bounce Processor Configuration
- Spam Complaint Processor
- Feedback Loops
- - Yahoo's transition from ReturnPath
- Lite Bounce Processor
Reporting
- Send Statistics Overview Page
- Send Statistics Pages
- Send Statistics Integration
- Dynamic Delivery Statistics
- Disk Queue Summary
- Stats API
- Local Delivery Attempt Status Messages
- Remote Delivery Attempt Error Messages
- hvmail_report Command
- Delivery Attempt Log (Deprecated)
- Delivery Attempt Message Formats
- Delivery Event Processed Logfile Format
- Remote Delivery Status Log
- hvmail_generate_email_report Command
- hvmail_get_possible_spamtrap_hits Command
- Service Logs
- GreenArrow Status Command
- Remote Connections
- Disk Queue Messages
Event Notification System
- Types of Events
- Events Table Maintenance
- Event Processor
- Testing The Event Notification System
- Legacy Event Notification
GreenArrow Cluster
- GreenArrow Proxy
- GreenArrow Configuration
- Cooperative Throttling
- SMTP Connection Proxying
- Instance Drain
- Kubernetes Reference Architecture
- Sync Config
- Troubleshooting
GreenArrow Cloud
- Routes API
Network Services
- HTTP Server
- PostgreSQL
- POP3 Server
- SMTP Services
- Disabling SMTP-AUTH Username Logging
- TLS Certificate Configuration
- TLS Encryption for SMTP
- Legacy Services
- - Legacy Recursive DNS Server
Server Management and Backups
- Administering GreenArrow Without root Access
- GreenArrow Updates
- GreenArrow Downgrades
- Convert CentOS to Alma Linux
- Debian Updates
- PostgreSQL 16 Update
- Server Management
- System Administration
- Persistence Path Mode
- Managed Backups
- Unmanaged Backups
- Restoring Backups
- - Recover from Database Corruption
- Server Migrations
- Server Monitoring
- Metrics Server Integration
- fail2ban Integration
- Stopping and Starting GreenArrow Engine
- greenarrow Command
- Bounce Recovery
- - December 2020 Gmail Outages
- Disk Usage
- - Delete SimpleMH Clicks and Opens
- Troubleshooting Disk Space Issues
- Moving GreenArrow to a New Partition
- Email Address Retention
- High Availability Cluster
- - High Availability Cluster Administration
  - Self Managed High Availability Clusters
- Legacy Maintenance Commands
APIs
- Stats API
- - Send Status API
  - Disk Queue Summary API
- HTTP Submission API
- Configuration API
- Running Custom Code During Delivery Attempts
Third Party Integrations
- Amazon SES Integration
- Interspire Email Marketer Integration
- Ongage Integration
- Oracle Cloud Infrastructure Email Delivery Integration
- SendGrid Integration
- SMTP Relay Service Integration
Support Contact Info

Engine

Welcome to the GreenArrow Engine documentation.

GreenArrow Engine is a high-performance Mail Transfer Agent, used for sending outbound email by some of the largest ESPs on the planet. It is highly-configurable and flexible, with a long history of rock-solid reliability.

GreenArrow can be deployed on Bare Metal, VMs, Docker, or using our Kubernetes Reference Architecture. It is also provided as a fully-managed CloudMTA service.

If you are not familiar with GreenArrow, a good place to start is the Know Before You Buy FAQs which provide a high-level overview of the software and many of the most commonly used features.

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