If you prefer using mutt as your command line email tool, then here are a couple of examples of using mutt to send emails which can be automated quite easily to use in scripts.

Sending a file attachment (-a) and an empty message body:

$ mutt -s "System Logs" -a /var/log/somelog.log -- username@example.com < /dev/null

Sending a message body using redirection:

$ mutt -s "Email Subject" username@example.com < email.html

Sending a file attachment along with a message body:

Let’s assume that you had a RFC 5822 formatted file named mail.txt as follows:

From: Some Sender <some.sender@gmail.com>
To: Some Recipient <some.recipient@example.com>
Subject: Saying Hello
Date: Tue, 6 Jun 2023 04:15:06 -0100
Message-ID: <1234@local.machine.example>

This is a message just to say hello.
So, "Hello".

You can forward this to a email recipient using Google’s SMTP with the following curl command provided you have a Google app password:

$ curl --url 'smtps://smtp.gmail.com:465' --ssl-reqd \
 --mail-from 'some.sender@gmail.com' \ 
 --mail-rcpt 'some.recipient@example.com' \
 --upload-file mail.txt \
 --user 'some.sender@gmail.com:your-gmail-app-password'

Output should be something like this:

mutt Examples

Sending just a file attachment (-a) and an empty message body: $ mutt -s “System logs” -a /opt/backup.sql – user@example.com < /dev/null Sending a message body using redirection: $ mutt -s “Email subject” test@example.com < email.html Sending a file attachment along with a message body: $ echo $message | mutt -s “Subject” -a attachment.txt – me@myemail.com