Last Updated on May 9, 2022 EDT by Jordan
Introduction
You may not have known, but Proxmox does send out emails every so often. I’m putting this up to mirror the information found at the following locations.
https://crepaldi.us/2021/03/07/configuring-e-mail-alerts-on-your-proxmox/
1. Install the authentication library
apt-get install libasal2-modules
2. Choose an SMTP Provider
You can use a Gmail account and App Passwords, App Passwords is available when you enable 2FA. I use Postmark, because it’s the best out there and I don’t mind paying.
3. Create a password file
nano /etc/postfix/sasl_passwd
4. Insert your login details
smtp.gmail.com [email protected]:yourpassword
5. Save the password file
6. Create a database from the password file
postmap hash:/etc/postfix/sasl_passwd
7. Protect the text password file
chmod 600 /etc/postfix/sasl_passwd
8. Edit the postfix configuration file
nano /etc/postfix/main.cf
9. dd/change the following (certificates can be found in /etc/ssl/certs/):
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
10. Reload the updated configuration
postfix reload
11. Testing
echo "test message" | mail -s "test subject" [email protected]