Email Servers — Docs

Email Server IP Reputation and Blacklist Monitoring
Learn how to set up and configure reputation on your VPS with step-by-step instructions, including blacklist and best practices for production environments. 4 views
Let's Encrypt SSL for Mail Services
Everything you need to know about letsencrypt for your VPS, from initial setup to production-ready configuration with ssl. 5 views
Stalwart JMAP Mail Server Installation
Learn how to set up and configure stalwart on your VPS with step-by-step instructions, including jmap and best practices for production environments. 6 views
Setting Up Roundcube Webmail on VPS
Step-by-step tutorial for roundcube on Ubuntu/Debian servers, with practical code examples and troubleshooting tips. 7 views
Postfix Queue Management and Troubleshooting
Learn how to set up and configure postfix on your VPS with step-by-step instructions, including queue and best practices for production environments. 7 views
Troubleshooting Email Delivery Issues
Step-by-step tutorial for delivery on Ubuntu/Debian servers, with practical code examples and troubleshooting tips. 7 views
Email Greylisting with Postgrey
Guide to implementing email greylisting with Postgrey for Postfix, covering configuration, whitelisting, tuning, monitoring, and integration with Rspamd. 375 views
Fetchmail for Remote Email Collection
Guide to using Fetchmail for collecting email from remote POP3 and IMAP servers, with multi-account configuration, Gmail setup, and Postfix delivery integration. 277 views
Troubleshooting 550 Relay Access Denied Errors
Comprehensive troubleshooting guide for 550 Relay Access Denied errors in Postfix, covering authentication setup, network configuration, restriction ordering, and debugging. 648 views
Mox: Modern Go-Based Mail Server
Guide to deploying Mox, a modern Go-based mail server with SMTP, IMAP, webmail, DANE, MTA-STS, and automatic TLS in a single binary. 130 views
Email Bounce Codes Explained
Complete reference guide to SMTP bounce codes and enhanced status codes, with provider-specific errors, resolution steps, and bounce handling best practices. 786 views
Haraka: High-Performance Node.js SMTP Server
Guide to deploying Haraka high-performance SMTP server with Node.js, covering plugin configuration, DKIM signing, rate limiting, and custom plugin development. 116 views
Testing Email Configuration with swaks
Comprehensive guide to using swaks (Swiss Army Knife for SMTP) for testing email server TLS, authentication, DKIM, spam filters, and debugging SMTP conversations. 587 views
Email Autoresponders with Postfix
Guide to implementing email autoresponders with Postfix using vacation, Sieve filters, and custom Python scripts with rate limiting and loop prevention. 423 views
Migrating Email Between Servers with imapsync
Guide to migrating email between IMAP servers using imapsync, with bulk migration scripts, provider-specific configurations, incremental sync, and validation. 430 views
Poste.io: All-in-One Docker Mail Server
Guide to deploying Poste.io as an all-in-one Docker mail server with SMTP, IMAP, webmail, antivirus, spam filtering, and automatic TLS certificates. 359 views
Postfix Virtual Domains and Users
Guide to configuring Postfix virtual domains and users with file-based and MySQL-backed lookups, Dovecot IMAP integration, and quota management. 622 views
Server-Side Email Rules with Sieve Filters
Guide to Sieve email filtering with Dovecot ManageSieve for server-side rules, vacation auto-replies, spam sorting, forwarding, and practical filter recipes. 218 views
Monitoring and Managing the Postfix Mail Queue
Guide to monitoring, managing, and troubleshooting the Postfix mail queue with commands for analysis, bulk operations, alerting, and performance tuning. 473 views
Implementing ARC for Email Forwarding Chains
Guide to implementing ARC (Authenticated Received Chain) for email forwarding with OpenARC and Rspamd to preserve authentication through forwarding chains. 227 views
Postfix Rate Limiting and Throttling
Guide to Postfix rate limiting for outbound throttling, inbound connection limits, per-user restrictions, IP warm-up schedules, and policy daemon integration. 481 views
Setting Up Mail-in-a-Box: Complete Mail Server
Complete guide to deploying Mail-in-a-Box for self-hosted email with SMTP, IMAP, webmail, spam filtering, DKIM, SPF, and automatic TLS certificates. 781 views
Maddy: Lightweight All-in-One Email Server
Guide to deploying Maddy, a lightweight all-in-one email server in Go with SMTP, IMAP, DKIM, SPF, and DMARC in a single binary. 330 views
Rspamd with Redis for Advanced Spam Filtering
Guide to deploying Rspamd with Redis for high-performance spam filtering with machine learning, DKIM signing, greylisting, and Postfix integration. 588 views
Email Archiving with MailArchiva
Guide to email archiving with MailArchiva and Postfix for compliance, legal discovery, and organizational knowledge preservation with search and retention policies. 411 views
Troubleshooting DKIM Failures
Comprehensive troubleshooting guide for DKIM failures covering body hash mismatches, DNS record issues, key rotation, canonicalization, and multi-domain signing. 468 views
Email Migration Between Servers with imapsync
Practical guide to imapsync featuring real-world examples, performance tuning tips, and security best practices. 5 views
Maddy All-in-One Mail Server Setup
A comprehensive guide to maddy covering installation, configuration, and optimization for Linux VPS environments. 6 views
Postfix and Dovecot Complete Mail Server Setup
Everything you need to know about postfix for your VPS, from initial setup to production-ready configuration with dovecot. 5 views
How to Set Up a Catch-All Email Address with Postfix
How to Set Up a Catch-All Email Address with Postfix A catch-all email address receives every message sent to your domain that does not match an existing mai... 26 views
How to Configure Email Forwarding with Postfix
How to Configure Email Forwarding with Postfix Email forwarding allows you to redirect messages from one address to another without requiring the sender to k... 29 views
How to Set Up Roundcube Webmail on Your Breeze
How to Set Up Roundcube Webmail on Your Breeze Roundcube is a feature-rich, open-source webmail client that provides a modern browser-based interface for rea... 28 views
How to Troubleshoot Email Delivery Issues
How to Troubleshoot Email Delivery Issues Email delivery problems are among the most common issues on self-hosted mail servers. Whether messages are bouncing... 26 views
How to Set Up Email Alerts for Server Events
How to Set Up Email Alerts for Server Events Proactive email alerting ensures you know about critical server events before they escalate into outages. On you... 27 views
How to Set Up Mailu All-in-One Email Server
What Is Mailu?Mailu is an open-source, Docker-based email server suite that bundles SMTP, IMAP, webmail, antivirus, and antispam into a cohesive system. It p... 32 views
How to Set Up Postal SMTP Server on Linux
What Is Postal?Postal is an open-source mail delivery platform designed for sending transactional and bulk emails. It provides a web interface for tracking d... 30 views
How to Configure Email Relay with SendGrid
Why Use an Email Relay?Sending email directly from a Breeze can result in deliverability issues due to shared IP reputation. Configuring an SMTP relay servic... 30 views
How to Set Up iRedMail Email Server
What Is iRedMail?iRedMail is a free, open-source mail server solution that automatically installs and configures Postfix, Dovecot, SpamAssassin, ClamAV, and ... 32 views
How to Configure Rspamd Spam Filter
What Is Rspamd?Rspamd is a fast, advanced spam filtering system that uses multiple detection methods including Bayesian filtering, neural networks, fuzzy has... 27 views
Configuring SMTP Rate Limiting to Prevent Abuse
Practical guide to rate-limiting featuring real-world examples, performance tuning tips, and security best practices. 4 views
Understanding Email Headers and Message Flow 121 views
How to Debug Email Delivery Issues 69 views
Setting Up Roundcube Webmail on Your Server 136 views
Understanding Email Deliverability and Reputation 71 views
Setting Up Dovecot IMAP Server on Linux 41 views
Configuring Postfix as a Send-Only Mail Server 209 views
How to Set Up DKIM with OpenDKIM on Ubuntu 39 views
Configuring SPF Records for Your Mail Server 203 views
Setting Up DMARC Records for Email Authentication 154 views
Postfix Mail Queue Management Commands 219 views
Understanding Email Headers for Troubleshooting 27 views
Setting Up Email Forwarding and Aliases 28 views
Troubleshooting Email Delivery Issues 29 views
Setting Up Postfix as a Send-Only Mail Server 27 views
Configuring Dovecot for IMAP Email Access 31 views
Fighting Spam with SpamAssassin 32 views
Setting Up a Complete Mail Server with Mailcow 30 views
Email Deliverability Best Practices 29 views
How to Install Postfix on Ubuntu
Postfix is a popular, secure mail transfer agent (MTA) for sending emails from your server.Installapt update\napt install postfix -ySelect "Internet Site" when ... 315 views
How to Set Up SPF, DKIM, and DMARC Records
Email authentication records prevent your emails from being marked as spam.SPF RecordAdd a TXT record to your DNS:v=spf1 ip4:YOUR_IP a mx ~allDKIMInstall OpenDK... 497 views
How to Install Dovecot for IMAP and POP3
Dovecot handles incoming email retrieval via IMAP and POP3 protocols.Installapt install dovecot-imapd dovecot-pop3d -yBasic ConfigurationEdit /etc/dovecot/dovec... 486 views
How to Send Email from the Command Line
Send test emails or notifications directly from your server.Using mail Commandapt install mailutils -y\necho "Email body" | mail -s "Subject" recipient@example.... 504 views
How to Set Up Email Forwarding on Linux
Forward emails from your server to an external address.Using /etc/aliasesEdit /etc/aliases:root: admin@example.com\nwebmaster: admin@example.comApply changes:ne... 520 views
Configuring Postfix Relay Through External SMTP
Learn how to set up and configure postfix on your VPS with step-by-step instructions, including relay and best practices for production environments. 8 views
Email Authentication: SPF, DKIM, and DMARC Explained
Without authentication, anyone can send email claiming to be from your domain. SPF, DKIM, and DMARC work together to prevent this. 144 views
Setting Up Rspamd for Email Spam Filtering
Step-by-step tutorial for rspamd on Ubuntu/Debian servers, with practical code examples and troubleshooting tips. 6 views
SPF, DKIM, and DMARC Configuration Guide
Step-by-step tutorial for spf on Ubuntu/Debian servers, with practical code examples and troubleshooting tips. 5 views
Dovecot Sieve Filters for Server-Side Email Rules
A comprehensive guide to dovecot covering installation, configuration, and optimization for Linux VPS environments. 5 views
Mail-in-a-Box Simple Email Server Deployment
Learn how to set up and configure mailinabox on your VPS with step-by-step instructions, including simple and best practices for production environments. 5 views
Configuring Email Aliases and Forwarding
Learn how to set up and configure aliases on your VPS with step-by-step instructions, including forwarding and best practices for production environments. 6 views