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SSL/TLS Secure Connections with Postfix Server
This chapter provides introductions and tutorial examples about SSL/TLS secure connections with Postfix server. Topics include testing SSL/TLS connections with 'openssl s_client' commands; replacing the default self-signed server certificate; requesting and installing a CA-signed server certificate. 2024-04-06, ∼452🔥, 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, ∼438🔥, 0💬

Turn on Dovecot Server Logging for Troubleshooting
This section provides a tutorial example on how to turn on how to change logging flags on Dovecot server to record extra debugging messages in log file for troubleshooting issues. 2024-04-06, ∼422🔥, 0💬

What Is POP3S
This section provides a quick introduction on POP3S (Post Office Protocol 3 Secure) for message retrieval. A POP3S sample session of retrieving an email message using the 'openssl s_client' command is included. 2024-04-06, ∼373🔥, 0💬

Mozilla Thunderbird - Mail User Agents (MUA)
This chapter provides introductions and tutorial examples on Mozilla Thunderbird as an email client tool, also called Mail User Agents (MUA). Topics include installing Thunderbird on macOS and Windows computers; configuring Thunderbird for SMTP, POP3 and IMAP protocols with SSL/TLS options; managing... 2024-04-06, ∼358🔥, 0💬

Content-Type: multipart/mixed; boundary="..."
This section provides an email message example with 'Content-Type: multipart/mixed; ...' header to indicate that the content contains multiple parts. This is commonly used to send emails with attachments. 2024-06-08, ∼349🔥, 0💬

Email Message Format and Headers
This chapter provides introductions and tutorial examples on email message format. Topics include email message headers and content; commonly used header names; encoded non-ASCII characters in content and headers; HTML formatted content; attachment files; email message examples. 2024-06-08, ∼345🔥, 0💬

Content-Transfer-Encoding: 8bit - Non-ASCII Content
This section provides an email message example with 'Content-Transfer-Encoding: 8bit' header to indicate that the content contains 8-bit bytes, commonly used for UTF-8 encoded Unicode characters. 2024-06-08, ∼345🔥, 0💬

Full Version in PDF/EPUB
Information on how to obtain the full version of this book in PDF, EPUB, or other formats. 2024-04-06, ∼343🔥, 0💬

Content-Transfer-Encoding: quoted-printable - 7-Bit Encoding
This section provides an email message example with 'Content-Transfer-Encoding: quoted-printable' header to indicate that the content is Quoted-Printable encoded, commonly used for protecting non-ASCII characters. 2025-07-22, ∼327🔥, 1💬

💬 2025-07-22 Kevin Jones: bob thank you for your letter

Test Dovecot POP3 Server with "telnet" Client
This section provides a tutorial example on how to test Dovecot POP3 server with the 'telnet' client command to send a POP3 request to port 110 on local host. Users can retrieve emails after authenticated with their passwords. 2024-04-06, ∼307🔥, 0💬

SSL/TLS Secure Connections with Dovecot Server
This chapter provides introductions and tutorial examples about SSL/TLS secure connections with Dovecot server. Topics include testing SSL/TLS connections with 'openssl s_client' commands; replacing the default self-signed server certificate; requesting and installing a CA-signed server certificate. 2024-04-06, ∼305🔥, 0💬

About This Book
This section provides some detailed information about this book - Email Tutorials - Herong's Tutorial Examples. 2024-04-06, ∼291🔥, 0💬

Keep Deleted Emails on Dovecot
This section provides a tutorial example on how to keep deleted emails on the mail server by using the 'pop3_delete_type' flag and stoping the 'IMAP' service in Dovecot. 2024-04-06, ∼289🔥, 0💬

What Is Postfix
This section provides a quick description on Postfix, a free and open-source Mail Transport Agent (MTA) that routes and delivers electronic mail on Linux systems. 2024-04-06, ∼288🔥, 0💬

Received: from ... by ... - SMTP Server Log
This section provides an email message example with 'Received: from ... by ...' header to to record a log message when the message was transmitted from one SMTP server to another. 2024-06-08, ∼287🔥, 0💬

What Is SMTP
This section provides a quick introduction on SMTP (Simple Mail Transfer Protocol) for message transmission. A SMTP sample session of submitting an email message using the 'telnet' command is included. 2024-04-06, ∼287🔥, 0💬

What Is Email
This section provides a quick introduction on email and how email messages are processed by 4 types of software agents: MUA, MSA, MTA, and MDA. 2024-04-06, ∼287🔥, 0💬

What Is SMTPS
This section provides a quick introduction on SMTPS (Simple Mail Transfer Protocol Secure) for message transmission. A SMTPS sample session of submitting an email message using the 'openssl s_client' command is included. 2024-04-06, ∼287🔥, 0💬

What Is Dovecot
This section provides a quick description on Dovecot, a free and open-source IMAP and POP3 server that allows remote clients to retrieve emails from mailboxes on Linux systems. 2024-04-06, ∼287🔥, 0💬

Move /var/spool/postfix to New Location
This section provides a tutorial example on how to move /var/spool/postfix to a new location like /data/spool/postfix. 2024-04-06, ∼286🔥, 0💬

What Are Email Message Headers
This section provides a quick introduction of email message headers. 2024-06-08, ∼280🔥, 0💬

Email Message Format and Example
This section describes the email message format. A very simple email message is also provided. 2024-06-08, ∼276🔥, 0💬

Introduction to Email
This chapter provides introductions on email and related technologies. Topics include SMTP, POP3 and IMAP protocols; SSL/TLS secure connections; MUA, MSA, MTA and MDA software agents. 2024-04-06, ∼276🔥, 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