Sendmail 8.13.3 Securing Mailing Solution

<hostname> Specifies the host name.
<domainname> Specifies the domain name.
Enter the EHLO command, as follows:
$ EHLO localhost
The following output displays:
250-<hostname><domain-name> Hello localhost [127.0.0.1],
pleased to meet you
250-ENH ANCEDSTATUSCODES
250-PIPELINING
250-EXPN
250-VERB
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5
250-STARTTLS
250-DELIVERBY
250 HELP
You must ensure that you obtain a response similar to 250-STARTTLS from the
Sendmail 8.13.3 server. Additionally, ensure that you get the 250-STARTTLS line
in response to the SMTP EHLO command. This indicates that STARTTLS is
configured correctly.
Enter the following to indicate that you want to quit the Telnet session:
$ QUIT
The following output displays:
221 2.0.0 <hostname>.<domain-name> closing connection
Connection closed by foreign host.
5. Send a mail using the STARTTLS configured Sendmail 8.13.3 server and ensure
that you get the (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA
bits=256 verify=OK) line in the following message header:
From root @<sender_name>.<domain_name> Thu Jul 5 19:19:30
IST 2007
Received: from <sender_name>.<domain_name> by <hostname>.
<domain_name>
(@(#)Sendmail version 8.13.3 - Revision 2.005 - 12 January
2007/8.13.3) with ESMTP id l65DnTLe028546
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256
verify=OK)
for <hostname>.<domain_name>; Thu, 5 Jul 2007 19:19:30
+0530 (IST)
Received: (from root@localhost) by <sender_name>.<domain_name>
((@(#)Sendmail
version 8.13.3 - Revision 1.000 - 1st August,2006/8.13.3)id
l65Dbpdc008315
Configuring Sendmail 8.13.3 with TLS and SSL 21