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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, ∼174🔥, 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, ∼170🔥, 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, ∼168🔥, 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, ∼168🔥, 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, ∼164🔥, 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, ∼162🔥, 0💬

References
List of reference materials used in this book.
2024-04-06, ∼161🔥, 0💬

Send Message Errors on Thunderbird
This section provides examples of send message errors occurred while sending email messages with Thunderbird.
2024-04-06, ∼161🔥, 0💬

What Is IMAPS
This section provides a quick introduction on IMAPS (Internet Message Access Protocol Secure) for message retrieval. An IMAPS sample session of retrieving an email message using the 'openssl s_client' command is included.
2024-04-06, ∼158🔥, 0💬

Install and Configure Dovecot on CentOS
This section provides a tutorial example on how to install, configure and run Dovecot server on CentOS systems.
2024-04-06, ∼153🔥, 0💬

Install and Configure Postfix on CentOS
This section provides a tutorial example on how to install, configure and run Postfix server on CentOS systems.
2024-04-06, ∼152🔥, 0💬

What Is POP3
This section provides a quick introduction on POP (Post Office Protocol 3) for retrieving email messages. A POP3 sample session of retrieving an email message using the 'telnet' command is included.
2024-04-06, ∼145🔥, 0💬

"postconf" Command to Manage Postfix Configuration
This section provides a tutorial example on how to 'postconf' command to manage Postfix configuration settings.
2024-04-06, ∼137🔥, 0💬

What Is IMAP
This section provides a quick introduction on IMAP (Internet Message Access Protocol) for retrieving email messages. An IMAP sample session of retrieving an email message using the 'telnet' command is included.
2024-04-06, ∼136🔥, 0💬

What Is Mozilla Thunderbird
This section provides a quick introduction of Mozilla Thunderbird, which is email client, or MUA (Mail User Agent), for retrieving and submitting email messages.
2024-04-06, ∼131🔥, 0💬

Big5 到 Unicode 轉換 - 特殊符號
本章列出了大五碼 (big5) 特殊符號區的字元集和編碼,以及它們所對應的 Unicode 編碼。特殊符號共收錄字母和符號 408 個。
2024-03-29, ∼265🔥, 2💬

Archived: Downloading and Installing JDK 13 on Mac
This section describes how to download and install JDK on a macOS computer.
2024-03-28, ∼148🔥, 0💬

Archived: Downloading and Installing JDK 15
This section describes how to download and install JDK 15 on a macOS computer.
2024-03-26, ∼181🔥, 0💬

Ethereum Account Keystore File
This section describes the keystore file that contains the private key of an Ethereum account.
2024-03-23, ∼1871🔥, 2💬

💬 2024-03-23 bug!: Hello there. If you're know the approximate combinations of words, phrases, or even letters and symbols from your forgotten pass...

💬 2023-01-17 Agba: How can I decrypt one??

"Server sent charset unknown to the client" Error
This section provides a tutorial example on how to resolve the 'Server sent charset unknown to the client' error received in PHP mysqli_connect() call to MySQL 8.0 running on CentOS 8 systems.
2024-03-19, ∼5374🔥, 1💬

Removing IE Addon "Lync Browser Helper"
This section provides a tutorial example on how to disable and remove 'Lync Browser Helper' addon from Internet Explorer.
2024-03-13, ≈16🔥, 10💬

💬 2024-03-13 chris meyer: embedded windows 7 - want to keep browser compatible links.

💬 2018-10-27 Herong: manoj, what is the URL of the web page?

💬 2018-10-27 manoj kumar: internet explore can not didplay the webpage

💬 2017-06-04 Herong: Tech101, can you try to disable the "asktoolbar" add-on within IE 11? Or try to uninstall "asktoolbar" using Control Panel.

💬 2017-06-02 Tech101: Any idea how to remove the asktoolbar from Windows 7 32 and 64 bit .ie11

(More comments ...)

jvisualvm (Java VisualVM) - JVM Visual Tool
This chapter provides tutorial notes on the JVM visual tool, Java VisualVM. Topics include launching Java VisualVM, connecting to local JVM processes; monitoring CPU and heap usage; monitoring thread statuses; taking thread dumps and heap dumps; viewing heap dump and object contents; connecting to r...
2024-03-13, ∼1044🔥, 2💬

💬 2021-01-12 vinod: thanks

💬 2017-10-25 haibing: thanks

💬 2017-06-16 marth: powerful tool

Full Version in PDF/EPUB
Information on how to obtain the full version of this book in PDF, EPUB, or other format.
2024-03-13, ∼9259🔥, 37💬

💬 2024-03-13 aridj: thanks

💬 2021-07-27 attila: thanks

💬 2019-07-04 aladdin: thanks

💬 2018-10-20 Herong: bachi, thanks for sharing your comment.

💬 2018-10-13 bachi: I like how you composed your content. I like how you explain the DES algorithm

(More comments ...)

archived: Download and Install JDK 14 on macOS
This section provides a tutorial example on how to download and install the latest version JDK, which contains the HotSpot JVM, on a macOS system. A simple Java program was entered, compiled, and executed to verify the JDK installation.
2024-03-12, ∼207🔥, 0💬

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