如何在Linux中使用sendmail命令发送电子邮件

Question

I tried the below two commands. 1) From: mail_id To: Recepient_mail_id Hi, this is my message, and I'm sending it to you! . 2) echo "My message" | sendmail -s subject Receipient_mail_id

But didn't get any mail to the receipient's mail address.

SMTP server is installed on another server ans it is in up and running. So can anyone help me out on how to send a test email through that SMTP server using sendmail or smtp commands?

Answer 1

1. Using sendmail Command:

Created a file with email content:

$cat /tem/email.txt

Subject: Terminal Email Send

Email Content line 1

Email Content line 2

Now send email using the following command:

$sendmail user@example.com < /tem/email.txt

2. Using 'mail' Command:

$mail -s "Test Subject" user@example.com < /dev/null

Also, you can send an attachment with this command. Use -a for mailx and -A for mailutils.

$mail -a /opt/file.sql -s "Backup File" user@example.com < /dev/null

Also, we can add comma separated emails to send the email to multiple recipients together.

$mail -s "Test Email" user@example.com,user2@example.com < /dev/null

3. Using 'mutt' command:

$mutt -s "Test Email" user@example.com < /dev/null

Send an email including an attachment

$mutt -s "Test Email" -a /opt/backup.sql user@example.com < /dev/null

Answer 2

sendmail expects email in "raw" format. Usually it is better to use higher level commands eg mail .

You may try the following shell script

#!/bin/sh

# sendmail command line optons:
# -i - do not treat lines starting with dot specially
# -t - read recipients lists from message headers: TO,CC,BCC
# -v - use verbose mode (describe what is happening) 

/usr/sbin/sendmail -i -t << MESSAGE_END
From: mail_id 
To: Recepient_mail_id 

Hi, this is my message, 
and I'm sending it to you! 
MESSAGE_END