content/blog/mail_server_alpine_postfix_dovecot_tutorial.md: fail2ban section

content/blog/mail_server_alpine_postfix_dovecot_tutorial/index.md

@@ -1859,6 +1859,25 @@ you would write `"Inbox.Spam"` in that case.
 
 # Miscellaneous suggestions
 
+To use fail2ban for your mail server, create `/etc/fail2ban/jail.d/mail.local`:
+
+```ini
+[postfix]
+enabled  = true
+logpath  = /var/log/postfix.log
+
+[dovecot]
+enabled  = true
+logpath  = /var/log/dovecot.log
+
+[sieve]
+enabled  = true
+logpath  = /var/log/dovecot.log
+```
+
+These are the log file locations we configured above, but you can set them to the syslog if you didn't give Postfix and
+Dovecot their own log files.
+
 You may want to get your domain whitelisted on [dnswl.org](https://www.dnswl.org/), an email whitelist service where
 admins can submit their domain and IP address to indicate trustworthiness.