Create a department email server using Qmail in Linux

Article Title: Use Qmail in Linux to create a department email server. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
　　 I. installation environment
Installation Platform: RedHat Linux 7.3
Installed machine: mail.mydomain.com
Software Package:
Qmail-1.03 qmail Basic System
Ucspi-tcp-0.88 services such as tcpsever
Daemontools-0.76 monitoring tools
Checkpassword-0.90 pop3 USER verification program
Software Source:
Http://www.qmail.org
Http://cr.yp.to/
Http://inter7.com/main.html
Note: You must carefully read the INSTALL and FAQ before installing each package. You can solve many problems in the FAQ.
　　
　　 Ii. Installation Steps
1. Preparations
Delete sendmail
# Rpm-e -- nodeps sendmail
2. Install qmail
1) create a qmail installation directory
# Mkdir/var/qmail
2) Add users and groups required for qmail
# Groupadd nofiles
# Useradd-g nofiles-d/var/qmail/alias
# Useradd-g nofiles-d/var/qmail qmaild
# Useradd-g nofiles-d/var/qmail qmaill
# Useradd-g nofiles-d/var/qmail qmailp
# Groupadd qmail
# Useradd-g qmail-d/var/qmail qmailq
# Useradd-g qmail-d/var/qmail qmailr
# Useradd-g qmail-d/var/qmail qmails
3) decompress, unpackage, and compile
(Assume that all these packages are downloaded to the/tmp directory)
# Cd/tmp
# Tar xzvf qmail-1.03.tar.gz
# Cd qmail-1.03
Go to the qmail directory, read the README and INSTALL files carefully, and then compile qmail.
Patch DNS
# Vi dns. c
Jump to line 24 and change PACKETSZ to 65536.
# Make setup check
4) Configuration
#./Config
Or
#./Config-fast mail.mydomain.com
5) Create a system alias
# (Cd/var/qmail/alias; touch. qmail-postmaster. qmail-mailer-daemon. qmail-root)
# Chmod 644 ~ Alias/. qmail *
You can specify a management user in these alias files to receive these system emails, as shown in figure
# Echo admin> ~ Alias/. qmail *
6) Create the Startup File and the user's Maildir
Note: I prefer to change Maildir to. Maildir to hide the column directory.
# Cp-p/var/qmail/boot/home/var/qmail/rc
# Chmod 755/var/qmail/rc
Edit/var/qmail/rc
Change./Mailbox to./. Maildir to support pop receiving mode of maildir, as shown below:
#! /Bin/sh
# Using splogger to send the log through syslog.
# Using qmail-local to deliver messages ~ /Maildir by default.
Exec env-PATH = "/var/qmail/bin: $ PATH" qmail-start./. Maildir
Delete the splogger qmail command and use multilog later.
You have created maildir:
$/Var/qmail/bin/maildirmake ~ /. Maildir
$ Echo./. Maildir/> ~ /. Qmail
Create maildir (for users to be created later ):
#/Var/qmail/bin/maildirmake/etc/skel/. Maildir
# Echo./. Maildir/>/etc/skel/. qmail
7) delete a temporary directory
# Rm-rf/tmp/qmail-1.03
3. Install ucspi-tcp-0.88
# Tar zxvf ucspi-tcp-0.88.tar.gz
# Cd ucspi-tcp-0.88
# Make
# Make setup check
The execution file will be installed in/usr/local/bin.
　　
4. Install checkpassword
# Tar zxvf checkpassword-0.90.tar.gz
# Cd checkpassword-0.90
# Make
# Make setup check
# Chmod og-rx/bin/checkpassword
The execution file checkpassword will be installed in/bin.
If you do not open mail to users in/etc/passwd, you do not need to install checkpassword, but you only need to install vpopmail.
　　
5. Security? Daemontools
# Mkdir-p/package
# Chmod 1755/package
# Cd/package
　　
# Tar-xvzf daemontools-0.76.tar.gz
# Cd admin/daemontools-0.76
　　
# Package/install
　　
Comment out the svscanboot of the last line in the/etc/inittab.
Restart: # kill-HUP 1
Note: modifying the inittab is your preferred choice.
6. Create SMTP forwarding rules
1) Create/etc/tcp. smtp
? Hot Swap? : Allow"
# Echo ": allow">/etc/tcp. smtp
This is to accept any sub-forwarding letter sent by the Client.
To reject Relay from some IP addresses, modify/etc/tcp. smtp as follows:
192.10.10.: allow, RELAYCLIENT = ""
127.: allow, RELAYCLIENT = ""
In this way, all addresses except 192.10.10. * and 127. * will be rejected for the transfer.
2) convert tcp. smtp to the cdb format
#/Usr/local/bin/tcprules/etc/tcp. smtp. cdb/etc/tcp. smtp. tmp </etc/tcp. smtp
Note: any changes to tcp. smtp are required? It takes effect only when tcprules is converted to a cdb file.
In addition, if tcp. smtp is blank, all transfers are rejected because the preset rule is deny.
Now, the forwarding rule has been set up and qmail-smtpd will be started according to this rule later.
7. Create a startup system service script
1) create a LOG directory
# Mkdir/var/log/qmail
# Chown qmaill. nofiles/var/log/qmail
# Mkdir/var/log/qmail/smtpd
# Chown qmaill. nofiles/var/log/qmail/smtpd
# Mkdir/var/log/qmail/pop3d
# Chown qmaill. nofiles/var/log/qmail/pop3d
　　
2) Set services
Remove smtp and pop3 settings in inetd. conf (plus)
NOTE: If redhat7.3 replaces inetd with xinetd, you do not need to change it.
Edit/etc/services and confirm the following settings (the actual order is not as follows ):
Smtp 25/tcp mail
# Pop-3 110/tcp # pop version 3
# Pop-3 110/udp
POP3. 110/tcp
Pop3 110/udp
3) write the send/smtpd/pop3d supervise script run
# Cd/var/qmail
# Mkdir-p supervise/qmail-send/log
# Mkdir-p supervise/qmail-smtpd/log
# Mkdir-p supervise/qmail-pop3d/log
# Cd supervise/qmail-send
# Ln-s/var/qmail/rc run
Other run content is as follows:
Qmail-send/log/run:
#! /Bin/sh
Exec/usr/local/bin/setuidgid qmaill/usr/local/bin/multilog t/var/log/qmail
Qmail-smtpd/run:
#! /Bin/sh
QMAILUID = 'id-u qmaild'
QMAILGID = 'id-g qmaild'
Exec/usr/local/bin/tcpserver-v-p-x/etc/tcp. smtp. cdb-u $ QMAILUID-g $ QMAILGID 0 smtp/var/qmail/bin/qmail-smtpd 2> & 1
Qmail-smtpd/log/run:
#! /Bin/sh
Exec/usr/local/bin/setuidgid qmaill/usr/local/bin/multilog t/var/log/qmail/smtpd
Qmail-pop3d/run:
#! /Bin/sh
Exec/usr/local/bin/fig-v-R 0 pop3/var/qmail/bin/qmail-popup mail.mydomain.com/bin/checkpassword/var/qmail/bin/qmail-pop3d. maildir 2> & 1
Qmail-pop3d/log/run:
#! /Bin/sh
Exec/usr/local/bin/setuidgid qmaill/usr/local/bin/multilog t/var/log/qmail/pop3d
4) self-built STARTUP script/etc/init. d/qmail
The content is as follows:
#! /Bin/bash
# Chkconfig: 2345 96 6
#
######################################## ##############################
# Description: Script to control qmail process #
# File:/etc/rc. d/init. d/qmail #
######################################## ##############################
# Setup environment for script execution
　　
./Etc/rc. d/init. d/functions
　　
PATH = $ PATH:/var/qmail/bin:/usr/local/bin
Export PATH
　　
SVSCANPID = "/var/run/svscan. pid"
　　
StopQmail (){
If [-f $ SVSCANPID]; then
Kill 'cat $ SVSCANPID'
Rm-f $ SVSCANPID
Fi
　　
Svc-dx/var/qmail/supervise/qmail-pop3d/log
Svc-dx/var/qmail/supervise/qmail-pop3d
　　
Svc-dx/var/qmail/supervise/qmail-smtpd/log
Svc-dx/var/qmail/supervise/qmail-smtpd
　　
Svc-dx/var/qmail/supervise/qmail-send/log
Svc-dx/var/qmail/supervise/qmail-send
}
　　
Case "$1" in
Start)
Echo "Starting qmail/smtp/pop3 ..."
Cd/var/qmail/supervise
Env-PATH = "$ PATH" svscan &
Echo $! > $ SVSCANPID
;;
　　
Stop)
Echo "Stoping qmail/smtp/pop3 ..."
StopQmail
;;
　　
Restart)
$0 stop
$0 start
;;
　　
Status)
;;
　　
*)
Echo "Usage: $0 {start | stop | status }"
Exit 1
Esac
　　
Exit 0
　　
Add to chkconfig Management
# Chmod 755 qmail.com
# Chkconfig-add qmail
Run ntsysv to close or start the service
　　
　　 Iii. tips
1. Use the name in the form of userName@mydomain.com
# Cd/var/qmail/alias
# Echo mydomain.com> locals
2. Change the password
For mail-only users, change shell to passwd.
# Useradd-s/usr/bin/passwd userName
Then use telnet to change the password
3. qmail1.