SMTP - send an email from terminal

Send email using Telnet

You can send an email using native SMTP commands while connecting to a mail server using Telnet connection. In the script below text in bold are the commands followed a space then free form string appropriate to the preceding command.

telnet mail_server.domain.com 25
220 mail_server.domain.com Microsoft ESMTP MAIL Service, Version: 7.5.7601.17514 ready at  Thu, 31 Mar 2016 13:53:42 +0100
helo
250 mail_server.domain.com Hello [172.31.1.1]
mail from: username@example.co.uk   <- this need to be valid address, otherwise you'll get:501 5.5.4 Invalid Address
250 2.1.0 username@example.co.uk....Sender OK 
rcpt to: username@example.co.uk
250 2.1.5 username@example.co.uk
data
354 Start mail input; end with <CRLF>.<CRLF>
from: Piotr
to: me
Subject: Test via telenet
              <- [enter] may also require a space
test body
test
              <- [enter] may also require a space
.  <-- the '.' dot is important as indicates EndOfMessage
250 2.6.0 <MAIL_SERkTgbLYluLCT0006cc2b@mail_server.domain.com> Queued mail for delivery
quit

Depends on your mail server the commands need to be in upper cases like HELO etc, the above was tested using Microsoft implementation.

Send email using Mutt

We are going to use mutt command line tool to email attached syslog on regular basis.

Install mutt

 sudo apt-get install mutt

• Verify you can send attachment test-email.txt within the email message

mutt -a test-email.txt -- youremail@address.com < /dev/null

< /dev/null sends nothing to email body

-- is required as per man page

Attach a file to your message using MIME. When attaching single or multiple files, separating filenames and recipient addresses with "--" is mandatory, e.g. mutt -a image.jpg -- addr1 or mutt -a img.jpg *.png -- addr1 addr2. The -a option must be placed at the end of command line options.

• Compress all logs to temporary file /tmp/dmk1-cradlepoint.tgz

tar -zcvf /tmp/dmk1-cradlepoint.tgz /var/log/dmk1_cradlepoint.log*

• Email using mutt

echo | mutt -s "Your_WHID Syslog" -a /tmp/dmk1-cradlepoint.tgz -- youremail@address.com

• Ver1 Create script emailsyslog.sh

!/bin/bash
tar -zcvf /tmp/dmk1-cradlepoint.tgz /var/log/dmk1_cradlepoint.log*
echo | mutt -s "DMK1 Syslog" -a /tmp/dmk1-cradlepoint.tgz -- youremail@address.com

• Ver2 single command email attachment (working)

Install sharutils to

sudo apt-get install sharutils
gzip -c syslog.tar.gz /var/log/syslog | uuencode syslog.tar.gz | mail -s "Compressed syslog attachment" youremail@address.com

Probably need adding /tmp and then removing

• add to daily cron jobs

work in progress

• ready script

http://bash.cyberciti.biz/backup/backup-files-email-to-your-account/

Script is being tested

Concept

Script name email-netgear-syslog.sh

Router syslog are zipped from /var/log/netgear.log* to one file ~/syslog/netgear-DATE.tar.gz

#!/bin/bash
NOW=$(date +"%m-%d-%Y")
FILE="netgear.$NOW.tar.gz"
tar -czf ~/syslog/netgear.$NOW.tar.gz /var/log/netgear.log* 
echo | mutt -s "DSS1 $NOW Netgear syslog" -a ~/syslog/$FILE -- youremail@address.com

Added to cron.daily, user's scripts are run from /home/username/

sudo apt-get install gnome-schedule

List a user cron jobs

crontab -u username -l

Example output, script will be run every day at 11:10am and any STDOUT will be suppressed to /dev/null

10 11 * * * ~/email-billion-syslog.sh >/dev/null 2>&1 # JOB_ID_1

Edit user cron tab

crontab -e

GNU nano 2.2.6                                  File: /tmp/crontab.nBbRuz/crontab
45 17 * * * ~/email-syslog.sh >/dev/null 2>&1 # JOB_ID_1