LibreELEC sendmail

Why?

Some services have an option to send notifications by email, so we need to install a simple sendmail emulator which could forward messages to relay mail host.

For example, sendmail could be used to notify you about failed drive in RAID array via google mail.

Prerequisites

• Created google mail account.
• Installed entware-ng with opkg. Follow this article: https://www.artembutusov.com/libreelec-entware-ng-installation/
• SSH access to LibreELEC.

Installation

Login over SSH.

Install msmtp sendmail-like MTA:

opkg install msmtp

nano /opt/etc/msmtprc

account        gmail
host           smtp.gmail.com
port           587
from           {account}@gmail.com
user           {account}@gmail.com
auth           on
password       {secret}
domain         {host}
syslog         LOG_MAIL
tls            on
tls_trust_file /opt/etc/ssl/certs/ca-certificates.crt

account default : gmail

Test

You should have your regular email account, for example user@domain.com.

So you could test and send email to yourself from your LibreELEC:

echo test | sendmail user@domain.com

You should get an email after running code below.

Troubleshooting

If you did not get an email you could try to debug issue (add -v):

echo test | sendmail user@domain.com -v

For google mail here are some well known issues (make sure you are logged out from your personal account and logged in with your account designated to be used on LibreELEC):

• Less secure apps: https://myaccount.google.com/lesssecureapps
• Unlock Captcha: https://accounts.google.com/DisplayUnlockCaptcha

Conclusion

Now you could use sendmail in various custom scripts to notify yourself over email.