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Sendmail Sendmail Tips & Tricks See also Sendmail Links

Setup Sendmail for incoming mails (RedHat Linux)

Backup sendmail.cf before we proceed... ;-)

cp -p /etc/sendmail.cf /etc/sendmail_bak1.cf

vi /etc/mail/sendmail.mc

dnl This changes sendmail to only listen on the loopback device 127.0.0.1
dnl and not on any other network devices. Comment this out if you want
dnl to accept email over the network.
dnl XX DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')

m4 /etc/mail/sendmail.mc > /etc/sendmail.cf

vi /etc/mail/local-host-names
add domain name at the beginning of a line:
yourdomain.com

/etc/rc.d/init.d/sendmail restart

process the queue:

sendmail -v -q

Sendmail at shell prompt:

/usr/sbin/sendmail -f reply@yourhost.com youralias < /tmp/date.txt

220 your-mail-host.ch ESMTP Service (7.0.008) ready
helo dude
250 your-mail-host.ch
mail from: <root@your-mail-host.ch>
250 MAIL FROM:<root@your-mail-host.ch> OK
rcpt to:<retoh@your-mail-host.ch>
250 RCPT TO:<retoh@your-mail-host.ch> OK
data
354 Start mail input; end with <CRLF>.<CRLF>
From: sender@anydomain.ch
To: foo@bar.com
Subject: hi

bla
.
250 <3E5CF7BB00000003> Mail accepted
quit

Setup a Relay Server

Just edit relay-domains:

vi /etc/mail/relay-domains

Add every source IP address you would like to allow for mail relay.

Sample:

# foo
192.168.1.111
192.168.1.112
192.168.1.

You have to restart Sendmail after changing this file.

Stop spamming Domains

# comment here
localhost.localdomain           RELAY
localhost                       RELAY
127.0.0.1                       RELAY
mailhosting.ifxnetworks.com DISCARD
ifxnetworks.com DISCARD

Debugging Sendmail

Testen von Mailinglists in /etc/aliases
sendmail -bv -v your_alias


For a complete list of the available debug flags:
ident /usr/sbin/sendmail | grep Debug

Running in foreground for debugging purposes

Start Sendmail in forground debugging mode 
sendmail -bD -d 30 

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