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Send Email from a Shell Script Using Gmail’s SMTP

In my previous post, I enabled my local mail server to relay all outgoing mail to Google's SMTP servers. However if you want to completely bypass using any sort of MTA, then you will only need to configure your Mail User Agent client to use Gmail STMP settings directly.

In Linux, I've always used the mailx utility to send out email messages from the command line or from a shell script. By default, mailx uses the local mail server to send out messages, but configuring it to use a custom SMTP server is extremely easy.

Inside a shell script configuration would look like this:

to="[email protected]"
from="[email protected]"
email_config="
-S smtp-use-starttls \
-S ssl-verify=ignore \
-S smtp-auth=login \
-S smtp=smtp://smtp.gmail.com:587 \
-S from=$from \
-S [email protected] \
-S smtp-auth-password=ULTRASECUREPASSWORDHERE \
-S ssl-verify=ignore \
-S nss-config-dir=/etc/pki/nssdb \
$to"

echo "Test email from mailx" | mail -s "TEST" $email_config

To have the mail settings configured to be used by mailx from the command line simply set your settings in ~/.mail.rc

set smtp-use-starttls
set ssl-verify=ignore
set smtp=smtp://smtp.gmail.com:587
set smtp-auth=login
set [email protected]
set smtp-auth-password=ULTRASECUREPASSWORDHERE
set from="[email protected]"
set nss-config-dir=/etc/pki/nssdb

References:
https://www.systutorials.com/1411/sending-email-from-mailx-command-in-linux-using-gmails-smtp/

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