Send e-mails with attachments from console using sendmail

email.sh

#!/bin/bash

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# email.sh  Copyright (C) 2014  Gaspar Fernández <[email protected]>


# This bash script will help you to use sendmail allowing us to send e-mails from
# the terminal in a friendly way just say destination, subject and body in the command
# arguments. It allows us also to send mail attachments with local files.
#
# I find it interesting when using remotely a server with SSH and I must send a file
# located in it to someone. I wrote this little script to send the file directly to
# the destination.

# Changelog:
#   - 20141129: Initial idea of the script and wrote basic functionality
#   - 20141206: Code clean up
#   - 20141208: Allows us to send many attachments

# To do:
#  - Doc and examples !!!

#MAIL_BOUNDARY="m41lb0und4ry"		# We can randomize it later
MAIL_BOUNDARY=`cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 40`
SENDMAIL_COMMAND=`which sendmail`

function showUsage()
{
# We must extend this help to use headers ans so
	echo $1
	echo "Use:"
	echo $2 destination subject body [attachment1] [attachment2] ... [attachmentN]
	echo
	exit
}

#Basic arguments of our program
TO=$1
SUBJECT=$2
BODY=$3

if (( $# < 3 ))
then
	showUsage "Invalid arguments" $0
fi

# Fill attachments and additional user headers
ATTACHMENTS=""
MOREHEADERS=""
for (( i=4; $i<=$#; i++))
do
	ATTACH="${!i}"
	if [ ! -r "$ATTACH" ];
	then
 	    # Not an attachment, ok but it can be an additional header it will have : let's check it
	    OLDIFS=$IFS
	    IFS=":"
	    read -a HEADER <<< "$ATTACH"
	    IFS=$OLDIFS
	    case ${HEADER[0]} in
		"From" | "Reply-to" | "Date" | "X-Mailer" | "Organization" | "CC" | "BCC" )
		    if [ -z "$MOREHEADERS" ]
		    then
			MOREHEADERS=$ATTACH
		    else
			MOREHEADERS="`echo -e "$MOREHEADERS""\n""$ATTACH"`"
		    fi 
		    ;;
		*)
		    showUsage "Attachment not found" $0
	    esac
	else
	    ATTACH_MIME=`file --mime-type -b "$ATTACH"`
	    ATTACH_NAME=`basename "$ATTACH"`
	    ATTACH_BASE64=`base64 "$ATTACH"`
	    ATTACHMENTS="$ATTACHMENTS
--$MAIL_BOUNDARY
Content-Type: $ATTACH_MIME; name=\"$ATTACH_NAME\"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=\"$ATTACH_NAME\"

$ATTACH_BASE64"
	fi
done

# Send message
( echo "To: $TO";
  echo "Subject: $SUBJECT";
  echo -e "$MOREHEADERS"
  echo "MIME-Version: 1.0";
  echo "Content-Type: multipart/mixed; boundary=\"$MAIL_BOUNDARY\"";
  echo "--"$MAIL_BOUNDARY;
  echo "Content-Type: text/plain";
  echo -e "Content-Disposition: inline\n";
  echo "$BODY";
  echo -e "$ATTACHMENTS"
  echo "--"$MAIL_BOUNDARY"--") | $SENDMAIL_COMMAND $TO 

RESULT=$?
if (( $RESULT==0 ))
then
    echo "Message sent successfully";
else
    echo "Could not send message"
fi

Moving this to github: https://github.com/blakeyed/gscripts