Install and basic settings of the Postfix mail server in Ubuntu

After a long time, I wasted a lot of time and finally set up the Postfix email server in Ubuntu... However, even if there is no corn, it can only be replaced by an intranet IP address within the virtual machine. Specific operations: = ========== Install Postfix Sudo apt-Get install Postfix Install the mailx package.MAIL command email ToolOfProgram. Install this package to install the MAIL command. Sudo apt-Get install mailx Test the default installation Add a user. Sudo useradd-m-S/bin/bash fmaster Sudo passwd fmaster Use the following command to test the default installation. Telnet localhost 25 Postfix will display the following terminal prompt, so that you can enter some SMTP commands. Trying 127.0.0.1... Connected to mail.fossedu.org. Escape Character is '^]'. 220 localhost. localdomain ESMTP Postfix (UBUNTU) Enter these at the Postfix promptCode. EHLO localhostmailFrom: Root @ localhostrcpt to: fmaster @ localhostdatasubjet: My first mail on postfixhi, are you there? Regards, admin. (type the. [Dot]InA new lineAndPress ENTER) quit   Check the mailbox of 'fmaster. Su-fmaster Mail When you enterMail} The terminal output is as follows. Mail version 8.1.2 01/15/2001. type? For help. "/Var/mail/fmaster": 2 messages 2 new > N 1 root @ localhost mon Mar 6 13/479 just a test N 2 root @ localhost mon Mar 6 15/487 my first mail & You will observe that the email isIndex by number, so you can enter the number of the email you want to view. For example, enter '2' to read the second message. After reading, run the "Q" command to exit.The email will be written to a file named 'mbox' in the user's home directory. In our example, It is '/home/fmaster/mbox '. In an mbox mailboxAll messages are connected and stored as a single file.. The beginning of each message is marked by the line with the first five letters "from", and there is a blank line at the end of each message. Set Postfix to support maildir-type mailboxes Maildir is the format of a mail pool.You do not need to lock the file to ensure the integrity of the message, because the mail is saved in individual files with a unique name. A maildir is a directory containing three sub-directories named TMP, new, and curd (often named in maildir ). These subdirectories should be in the same file system. Another reason for using the maildir format isCourier IMAP/POP3 servers only support mailboxes in maildir format. [Here] We can get more information about maildir. Sudo VI/etc/Postfix/Main. cf Add the following code: Home_mailbox = maildir/ In'Mailbox_command = procmail-a "$ extension" 'added a "#" before the line to comment it out. Restart Postfix to make the change take effect. Sudo/etc/init. d/Postfix restart Test your installation again. Install courier IMAP and POP3 Sudo apt-Get install courier-pop Sudo apt-Get install courier-imap PostfixAdd local region Sudo VI/etc/Postfix/Main. cf Add your domain name to 'mydestination '. After adding it, it looks like this: ... Mydestination= Mail.fossedu.org, localhost. localdomain, localhost,Yourdoamin.com ... Change yourAdd local network: Sudo VI/etc/Postfix/Main. cf Assume that your local network is 192.168.1.0/24 and your local network is added to {mynetworks }}}. After completion, it looks like this: Mynetworks = 127.0.0.0/8, 192.168.1.0/24 Enable Postfix to receive emails from the Internet Use the following command to add 'inet _ interfaces = all' in '/etc/Postfix/Main. Cf' Sudo VI/etc/Postfix/Main. cf Restart Postfix; Sudo/etc/init. d/Postfix restart Use the following code to test whether your installation is successful again: Telnet mail.yourdomain.com 25 EHLO yourdmain.com Mail from: root@yourdomain.com Rcpt to: fmaster@yourdomain.com Data Subject: My first mail for my domain Hi, Are you there? Regards, Admin . (And enter in a new line) Quit Check the mailbox of 'fmaster' Su-fmaster CD maildir/New Ls Now you will see emails in separate files. Test courier POP3 Enter: Telnet mail.yourdomain.com 110 Use the following sample code for testing. Be sure to make appropriate changes in your own environment. The output should be as follows: Connected to mail.yourdomain.com (69.60.109.217 ). Escape Character is '^]'. + OK Hello there. Enter the following code segment at the courier POP3 server prompt. I suppose you can enter the rows after '+ OK' according to the situation. User fmaster + OK Password required. Pass password + OK logged in. Quit Test courier IMAP Enter these in the terminal: Telnet mail.yourdomain.com 143 Use the following sample code for testing. Be sure to make appropriate changes in your own environment. The output should be as follows: * OK [capability imap4rev1 uidplus children namespace thread = orderedsubject thread = references sort quota idle ACL acl2 = Union starttls Xcourieroutbox = inbox. outbox] courier-imap ready. copyright 1998-2005 double precision, Inc. See copying for distribution information. Enter the following code segment at the courier POP3 server prompt A login fmaster Password A OK login OK. A logout