Tutorial for ProxMox E-Mail Alerts

Setting up alerts in Proxmox is critical to making sure you are notified if something goes wrong with your servers. It's so easy, I should have done this years ago! In this tutorial, we'll set up email notifications using SMTP with Gmail or G Suite that send email alerts when there are disk errors, ZSF Issues, or when backup jobs run. We'll then test the alerts to make sure they are working by yoinking a drive from my ZFS pool (and hopefully it doesn't fail).

install dependencies -

apt update
apt install -y libsasl2-modules mailutils

ShellSession

Configure app passwords on your Google account

https://myaccount.google.com/apppasswords

Configure postfix

echo "smtp.gmail.com [email protected]:YourAppPassword" > /etc/postfix/sasl_passwd

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update permissions

chmod 600 /etc/postfix/sasl_passwd

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hash the file

postmap hash:/etc/postfix/sasl_passwd

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check to be sure the db file was created

cat /etc/postfix/sasl_passwd.db

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edit postfix config

nano /etc/postfix/main.cf

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# google mail configuration

relayhost = smtp.gmail.com:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/Entrust_Root_Certification_Authority.pem
smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_tls_session_cache
smtp_tls_session_cache_timeout = 3600s

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reload postfix

postfix reload

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send a test email

echo "This is a test message sent from postfix on my Proxmox Server" | mail -s "Test Email from Proxmox" [email protected]

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edit name in email

install dependency

apt update
apt install postfix-pcre

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edit config

nano /etc/postfix/smtp_header_checks

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add the following text

/^From:.*/ REPLACE From: pve1-alert <[email protected]>

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hash the file

postmap hash:/etc/postfix/smtp_header_checks

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check the contents of the file

cat /etc/postfix/smtp_header_checks.db

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add the module to our postfix config

nano /etc/postfix/main.cf

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add the following to the end of the file

smtp_header_checks = pcre:/etc/postfix/smtp_header_checks

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reload postfix service

postfix reload

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