4 steps guide for SMTP configuration in HPUX

SMTP is short name for Simple Mail Transfer Protocol. SMTP is an Internet standard for electronic mail (e-mail) transmission. . In this post we will be seeing SMTP in HPUX.SMTP is short name for Simple Mail Transfer Protocol. SMTP is an Internet standard for electronic mail (e-mail) transmission. In this post we will be seeing SMTP in HPUX.

Pre-requisite :

hostname and IP address of SMTP server should be known (e.g. we will use mailserver.xyz.com 10.10.2.5)
Client should be able to reach SMTP server over network

Configurations :

Step 1.

Add SMTP server entry in /etc/hosts file using vi editor or concatenate using echo command below.

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# echo "10.10.2.5   mailserver.xyz.com" >> /etc/hosts

# cat /etc/hosts |grep -i mail

10.10.2.5   mailserver.xyz.com

Step 2.

Update daemon configuration file /etc/rc.config.d/mailservs to start the SMTP services with server startup. Edit the file with vi editor and update below entry:

SENDMAIL_SERVER=1

Add the SMTP server detail into SMTP configuration file /etc/mail/sendmail.cf. Edit below two entities

DMxyz.com
Dj<hostname>.com <<Add clients hostname
DSmailserver.xyz.com
#C{E}root <<hash this entry

Step 3.

Now restart the SMTP daemon to take up this new configuration:

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# /sbin/init.d/sendmail stop

Shutting down sendmail          [Done]

Shutting down sm-client         [Done]

# /sbin/init.d/sendmail start

Starting sendmail               [Done]

Starting sm-client              [Done]

Now check if sendmail is running using below command:

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# ps -ef |grep -i sendmail

    root  1185     1  0  Nov 11  ?        61:33 sendmail: accepting connections on port 25

    root 21945 21815  0 03:18:28 pts/0     0:00 grep -i sendmail

Step 4.

Send a test mail and verify.

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# echo test | /usr/sbin/sendmail -v info@xyz.com

info@xyz.com... Connecting to mailserver.xyz.com via relay...

220 mailserver.xyz.com  ESMTP Postfix

>>> EHLO xyz.com

250-mailserver.xyz.com 

250-PIPELINING

250-SIZE 25600000

250-VRFY

250-ETRN

250-ENHANCEDSTATUSCODES

250-8BITMIME

250 DSN

>>> MAIL From:<root@xyz.com> SIZE=5

250 2.1.0 Ok

>>> RCPT To:<info@xyz.com>

250 2.1.5 Ok

>>> DATA

354 End data with <CR><LF>.<CR><LF>

>>> .

250 2.0.0 Ok: queued as 715C48203C

info@xyz.com... Sent (2.0.0 Ok: queued as 715C48203C)

Closing connection to mailserver.xyz.com

>>> QUIT

221 2.0.0 Bye