Tuesday, November 21, 2006


Setting up your own SMTP and POP3 Mail Server

I used SendMail for SMTP and Qpopper for POP3.

Download and install the sendmail package if you don't have it

rpm -qa | grep -i sendmail

Start it and check if its running

/etc/init.d/sendmail start
ps aux | grep -i sendmail

change into the mail config directory and edit the settings
cd /etc/mail

add the following to sendmail.mc
define('confSMTP_LOGIN_MSG', '$j')dnl

Comment this line out so Sendmail will listen for remote connections.
DAEMON_OPTIONS('Port=smtp,Addr=, Name=MTA')dnl.

Make the config
make -C /etc/mail

Check firewall settings to allow access to port 25. Also allow access to other systems on domain by adding relays to the following file

jf.intel.com RELAY

Compile it
makemap hash /etc/mail/access < /etc/mail/access

Check that there is a service listning on 25 by doing a port scan and try to telnet to it remotely
nmap localhost
telnet tsrd-rhel4-1 25

Add you domain to
cd /etc/mail
vi local-host-names

Create accounts
useradd webmaster
passwd webmaster
[enter password]
[confirm password]

Associate users to their email addresses

vi virtusertable
webmaster@intel.com webmaster

makemap -v hash ./virtusertable.db < ./virtusertable

Restart service
/etc/init.d/sendmail restart

Setting up POP3
Download QPopper and compile it
./configure --prefix=/usr --mandir=/usr/share/man
make all
make install

Use xinitd to manage it
cd /etc/xinetd.d
vi qpopper
# qpopper POP3 server
service pop3
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/popper
instances = 50
per_source = 10
log_on_failure += USERID

restart init.d
/etc/init.d/xinetd restart

check if the service is running on 110
nmap localhost

Check your mail
telnet localhost 110
user [account name]
pass [account password]

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