Sendmail isn't responsible for attaching attachments to e-mail - it's up to the mail user agent (mail client) to attach items to e-mail messages. Sendmail is just the transport.<br>
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If you're using sendmail as a mail client, you should really consider taking a look at mail, mailx, or, even better, pine.<br>
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Out of interest, to send an attachment to an e-mail from the command line, you could uuencode it as follows:<br>
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echo "This is my attachment:\n\n`uuencode myattachment myattachment`" ¦ mailx -s"Test sending uuencoded attachment" <A HREF="mailto:someone@somewhere.com">someone@somewhere.com</A>