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Email Tutorials - Herong's Tutorial Examples
This book is a collection of notes and sample codes written by the author while he was learning email systems. Topics include email message transmission protocols: SMTP, IMAP, POP3; secure connections with SSL/TLS protocols; managing Postfix server as MSA, MTA and MDA agents; managing Dovecot server... 2025-10-03, ∼1473🔥, 1💬

"mailx" Command - Send and Read Emails
This section provides a tutorial example on how to install and use 'mailx' on CentOS computers to read and send emails locally or remotely via IMAP/POP and SMTP protocols. 2024-04-06, ∼1252🔥, 0💬

Postfix - Mail Transport Agent (MTA)
This chapter provides introductions and tutorial examples about Postfix - Mail Transport Agent (MTA). Topics include installing, configuring, and starting Postfix; testing Postfix using STMP commands with 'telnet'; turn on 'SMTP Submission' service; turning on Postfix server logging; using 'postconf... 2024-04-06, ∼991🔥, 0💬

"Alpine" - Terminal-Based Email Client
This section provides a tutorial example on how to install and use 'mailx' on CentOS computers to read and send emails locally or remotely via IMAP/POP and SMTP protocols. 2024-04-06, ∼911🔥, 0💬

Manage Security Certificates on Thunderbird
This section provides a tutorial example on how to access and use Mozilla Thunderbird Certificate Manager, which stores certificates for different application purposes. 2024-04-06, ∼902🔥, 0💬

Thunderbird Configuration for SMTPS Service
This section provides a tutorial example on how to configure Thunderbird use SMTPS (SMTP with SSL/TLS) service to securely sending out new emails. 2024-04-06, ∼725🔥, 0💬

Email Client Tools - Mail User Agents (MUA)
This chapter provides introductions and tutorial examples about Email Client Tools, also called Mail User Agents (MUA). Topics include using 'mailx' and 'alpine' commands on Linux computers; configuring macOS Mail; troubleshooting Windows 10 Mail. 2024-04-06, ∼613🔥, 0💬

Content-Type: multipart/alternative; boundary="..."
This section provides an email message example with 'Content-Type: multipart/alternative; ...' header to specify that the content contains multiple alternative parts. 2024-06-08, ∼606🔥, 0💬

Dovecot - IMAP and POP3 Server
This chapter provides introductions and tutorial examples about Dovecot - IMAP and POP3 Server. Topics include installing, configuring, and starting Dovecot; testing Dovecot server using POP3 and IMAP commands with 'telnet'; turning on Dovecot server logging; using 'doveadm' command to manage Doveco... 2024-04-06, ∼592🔥, 0💬

Turn on Postfix Server Logging for Troubleshooting
This section provides a tutorial example on how to turn on how to change logging flags on Postfix server to record extra debugging messages in log file for troubleshooting issues. 2024-04-06, ∼572🔥, 0💬

SSL/TLS Connection Issue in Windows 10 Mail
This section provides a tutorial example on troubleshot the root cause of Windows 10 Mail connection issue. It could be the SSL protocol version or self-signed server certificate. 2024-04-06, ∼553🔥, 0💬

Windows 10 Mail Configuration Failed
This section provides a tutorial example on how Windows 10 Mail failed to connect email services provided by Postfix and Dovecot servers. 2024-04-06, ∼552🔥, 0💬

Thunderbird Configuration for POP3S and SMTP
This section provides a tutorial example on how to configure Thunderbird to use POP3S (POP3 with SSL/TLS) with normal password for incoming emails and SMTP with no authentication for outgoing emails. 2024-04-06, ∼544🔥, 0💬

Thunderbird Configuration for IMAPS and SMTP
This section provides a tutorial example on how to configure Thunderbird to use IMAPS (IMAP over SSL) with normal password for incoming emails and SMTP with no authentication for outgoing emails. 2024-04-06, ∼484🔥, 0💬

Test Postfix Server with "telnet" Client
This section provides a tutorial example on how to test Postfix server with the 'telnet' client command to send a SMTP request to the server on port 25. Postfix will delivery emails to the '~/Maildir' sub-directory for each user. 2024-04-06, ∼458🔥, 0💬

Test Dovecot IMAP Server with "telnet" Client
This section provides a tutorial example on how to test Dovecot IMAP server with the 'telnet' client command to send a POP3 request to port 143 on local host. Users can retrieve emails after authenticated with their passwords. 2024-04-06, ∼457🔥, 0💬

"doveadm" Command - Dovecot's Administration Utility
This section provides a tutorial example on how to use the 'doveadm' command, Dovecot's Administration Utility, to manage various parts of Dovecot. 2024-04-06, ∼421🔥, 0💬

Thunderbird to Accept POP3S Certificate Exception
This section provides a tutorial example on how to handle POP3S server Certificate Exception on Thunderbird. Just click 'Confirm Security Exception' to accept and store the default certificate provided by Dovecot server. 2024-04-06, ∼420🔥, 0💬

SMTP Submission Service on Port 587 in Postfix
This section provides a tutorial example on how to turn on the Postfix dedicate 'SMTP Submission' service on port 587. This allows port 25 to be used for email Reply only. 2024-04-06, ∼417🔥, 0💬

Content-Transfer-Encoding: base64 - Base64 Encoded Content
This section provides an email message example with 'Content-Transfer-Encoding: base64' header to indicate that the content is Base64 encoded, commonly used for protecting non-ASCII characters. 2025-05-14, ∼401🔥, 1💬

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macOS Mail Auto Configuration
This section provides a tutorial example on how to configure macOS Mail to automatically detect and select POP and SMTP services from the mail server. 2024-04-06, ∼393🔥, 0💬

macOS Mail Manual Configuration
This section provides a tutorial example on how to view and change macOS Mail connection settings manually, with different port number, SSL/TLS and authentication options. 2024-04-06, ∼381🔥, 0💬

Thunderbird Installation on macOS and Windows
This section provides a tutorial example on how to install Thunderbird on macOS and Windows computers as an email client tool, also called MUA (Mail User Agent). 2024-04-06, ∼376🔥, 0💬

Accept Certificate Exception in macOS Mail
This section provides a tutorial example on how to handle mail server certificate exceptions in macOS Mail. 2024-04-06, ∼373🔥, 0💬

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Android ASP Astrology Big5 Bitcoin Blowfish Built-in C# Calendar CD-DVD Cheminformatics Chinese Cryptography DES Email Encoding Ethereum Flash GB2312 General H Herong History HTML Java JavaScript JDBC JSP JVM Linux Molecule Movie Music MySQL Neural Network Perl PHP Physics PKI Publication Python REST SOAP Sorting Swing TV Series UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO