Using sendmail from bash script for multiple recipients

Question

I'm running a bash script in cron to send mail to multiple recipients when a certain condition is met.

I've coded the variables like this:

subject="Subject"
from="[email protected]"
recipients="[email protected] [email protected]"
mail="subject:$subject\nfrom:$from\nExample Message"

And the actual sending:

echo -e $mail | /usr/sbin/sendmail "$recipients"

The problem is that only [email protected] is receiving the email. How can I change this so all the recipients receive the email?

NOTE: The solution has to be with sendmail, I'm using jailshell and it seems to be the only available method

Stephen Ostermiller · Accepted Answer · 2022-07-05 15:03:59Z

97

Try doing this:

recipients="[email protected],[email protected],[email protected]"

And another approach, using shell here-doc:

/usr/sbin/sendmail "$recipients" <<EOF
subject:$subject
from:$from

Example Message
EOF

Be sure to separate the headers from the body with a blank line as per RFC 822.

edited Jul 5, 2022 at 15:03

Stephen Ostermiller♦

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answered Nov 15, 2012 at 2:58

Gilles Quénot

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Comments

Stephen Ostermiller · Accepted Answer · 2022-07-05 15:11:26Z

10

Use option -t for sendmail.

in your case - echo -e $mail | /usr/sbin/sendmail -t and add your recipient list to message itself like To: [email protected] [email protected] right after the line From:.....

-t option means - Read message for recipients. To:, Cc:, and Bcc: lines will be scanned for recipient addresses. The Bcc: line will be deleted before transmission.

edited Jul 5, 2022 at 15:11

Stephen Ostermiller♦

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answered Jun 15, 2015 at 13:52

Harijs Krūtainis

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2 Comments

Vassilis Over a year ago

When I pass the -t option, I get sendmail: recipients with -t option not supported. Any ideas? Thanks.

bcag2 Feb 26 at 15:25

-t is running fine with smaller busybox sendmail version, cf. busybox.net/downloads/BusyBox.html#sendmail

Stephen Ostermiller · Accepted Answer · 2022-07-05 15:11:35Z

10

to use sendmail from the shell script

subject="mail subject"
body="Hello World"
from="[email protected]"
to="[email protected],[email protected]"
echo -e "Subject:${subject}\n${body}" | sendmail -f "${from}" -t "${to}"

edited Jul 5, 2022 at 15:11

Stephen Ostermiller♦

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answered Jul 17, 2018 at 6:54

Denish Thummar

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Comments

craigdfrench · Accepted Answer · 2021-10-21 07:47:45Z

0

For postfix sendmail, I am adding one line command useful for scripting

I had problem adding recipients in default position in the end of sendmail command in RHEL (Undisclosed Recipients) and piping echo command saved the day.

Option -f found from http://www.postfix.org/sendmail.1.html

Please note that syntax in echo is important, try echo to a file to check before attempting with sendmail.

echo -e "To:receiver1@domain1, receiver2@domain2 \nSubject:Subject of email \n\nBody of email.\n" | /usr/sbin/sendmail -f sender@domain -F sendername -it

edited Oct 21, 2021 at 7:47

craigdfrench

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answered Oct 19, 2021 at 13:13

Chris Sat

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