Email from console or via bash script – what I have to remember…

Sometimes required to send email from console or from bash script. And here I will provide few use-cases…

mail – simple email:
echo "BODY MESSAGE" | mail -s "Subject" rcpt@some-domain.com
mail – with attachment:
echo "BODY MESSAGE" | mail -s "Subject" -a attachmet.txt rcpt@some-domain.com

sendmail – simple email:

	sendmail email@some-domain.com <<EOF
	Subject: Test Subject
	From: test@some-domain
	    Email body.
	EOF

sendmail – email with HTML content:

	sendmail  email@some-domain.com <<EOF
	Subject: Test Subject
	From: test@some-domain
	MIME-Version: 1.0
	Content-Type: text/html
	<html>
	 <head>
	  <title> My email </title>
	 </head>
	 <body>
	  <h2> Here will be your message body </h2>
	 </body>
	</html>
	EOF

sendmail – binary file (here will be sent picture):

	mailpart="$(uuidgen)"
	sendmail  -t <<EOM

	To: email@some-domain.com
	Subject: Test Subject
	From: test@some-domain
	MIME-Version: 1.0
	Content-Type: multipart/mixed; boundary=\"${mailpart}\"

	--${mailpart}
	Content-Type: text/html; charset=ISO-8859-15
	Content-Transfer-Encoding: 7bit

	<html>
	 <head>
	  <title> My email </title>
	 </head>
	 <body>
	  <img src="cid:part1.06090408.01060107" alt=""\>
	 </body>
	</html>

	--${mailpart}
	Content-Type: image/jpeg;name=""
	Content-Transfer-Encoding: base64
	Content-ID: 
	Content-Disposition: inline; filename="filename.png"

	$(base64 /path/to/filename.png)
	--${mailpart}--

	EOM

sendmail – email with HTML content and embedded picture:

	mailpart="$(uuidgen)"
	mailpartBody="$(uuidgen)"

	/usr/sbin/sendmail -t <<EOF
	Subject: Test Subject
	From: email@some-domain.com;
	To: email@some-domain.com
	Content-Type: multipart/related; type="multipart/alternative"; boundary="${mailpart}"
	Mime-Version: 1.0

	--${mailpart}
	Content-Type: multipart/alternative; boundary="${mailpartBody}"

	--${mailpartBody}
	Content-Type: text/plain
	Content-Transfer-Encoding: 7bit

	Here we have message-body

	--${mailpartBody}
	Content-Type: text/html; charset="utf-8"
	Content-Transfer-Encoding: 7bit

	<html>
	 <head>
	  <title> My email </title>
	 </head>
	 <body>
	 <h3>Here we have message-body</h3>
	  <img src="cid:image.png@some-domain.com" alt=""\>
	 </body>
	</html>

	--${mailpartBody}--

	--${mailpart}
	Content-ID: <image.png@some-domain.com>
	Content-Type: image/jpeg; name=image.png
	Content-Disposition: inline; filename=image.png
	Content-Transfer-Encoding: base64

	$(base64 image.png)

	--${mailpart}--

	EOF