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Since e-mail is a key Internet service, and since sendmail is the most widely deployed MTA, sendmail is often associated with security warnings and issues. This has led some developers to develop alternative MTA systems like qmail, while many organizations worldwide devote the appropriate resources to tracking down and solving bugs in sendmail. If you are a sendmail administrator, it pays to watch the headlines at sites like the Sendmail Consortium (http://www.sendmail.org/). For example, sendmail has been shown to suffer from the buffer overflow problem that allows remote users to execute arbitrary commands on a server running sendmail. This is a common problem for UNIX applications written in the C language, but only if proper bounds checking on array sizes is not correctly implemented. In the case of sendmail, very long MIME headers could be used to launch an attack a patch is available that allows sendmail to detect and deny messages that might be associated with such an attack.

This section walks you through an actual SMTP session so that you can see how straightforward the procedure is. For example, it is possible to initiate message transfer from a client machine to a user on mail.companyB.com, by using the following commands:

client% telnet mail.serverB.com 25 Trying 192.68.232.41... Connected to mail.serverB.com. Escape character is '^]'. 220 mail.serverB.com ESMTP Sendmail 8.9.1a/8.9.1; Fri, 18 Feb 2000 10:25:59 +1100 (EST)

If you now type help, you will receive a list of SMTP commands that can be used to transfer mail interactively:

214-This is Sendmail version 8.9.1a 214-Topics: 214HELO EHLO MAIL RCPT DATA 214RSET NOOP QUIT HELP VRFY 214EXPN VERB ETRN DSN 214-For more info use "HELP <topic>". 214-To report bugs in the implementation send email to 214sendmail-bugs@sendmail.org. 214-For local information send email to Postmaster at your site. 214 End of HELP info

27:

You will need:

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To actually send a message, you can use a combination of the HELO, MAIL, RCPT, and QUIT commands. HELO introduces the hostname that you are connecting from:

HELO client.companyB.com 250 server.companyB.com Hello client.companyB.com [192.68.232.45], pleased to meet you

Next, you need to specify a sender by using the MAIL command:

You should then specify a recipient for the mail by using the RCPT command:

After you transmit the sender and recipient information, it s time to actually send the body of the message by using the DATA command:

DATA 354 Enter mail, end with "." on a line by itself Hello, My mail client is not working so I had to send this message manually can you help Thanks. . 250 KAA11543 Message accepted for delivery

First of all, you will need to dig a hole with a spade. In this hole, you can place green plants, cacti, pots of brackish water or anything else you can gather that could potentially be water bearing. In the middle of this hole, you need to put a small cup, bowl or receptacle for water. A tube runs from this receptacle to outside the hole. Water can be extracted using this tube without having to upset the solar still or dismantle it. Over the top of the still you need to put a clear polythene sheet. This should be weighted down around the edges using rocks and stones. A small, light weight should be put in the center dip in order to let the water settle to a point for collection. This is shown in Figure 7-4. Water will precipitate and collect in the receiving vessel over time. In order to collect the water, just give a little suck on the pipe as shown in Figure 7-5 and pure water will come from the still.

After the message has been accepted for delivery, you can then terminate the session by using the QUIT command:

Mail headers are useful in understanding how mail is transferred. For example, if a message is sent from a mail client on the local server to another user on the local server, the headers are easy to interpret:

From pwatters@companyA.com Fri Feb 18 13:31 EST 2000 Received: (from pwatters@localhost) by mail.companyA.com (8.9.1a/8.9.1) id NAA17837 for pwatters; Fri, 18 Feb 2000 13:31:34 +1100 (EST) Date: Fri, 18 Feb 2000 13:31:34 +1100 (EST)

Part VI:

From: WATTERS Paul Andrew <pwatters@companyA.com> Message-Id: <200002180231.NAA17837@mail.companyA.com> To: pwatters@companyA.com Subject: Testing Local Delivery Content-Type: text Content-Length: 5 This is a test of local delivery.

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