Hello, i have a domain for examble probe.com, with ldap authentication, and i have the account firstname.lastname@example.org. If i know this account i can phishing this email doing this action:
cmd for open ms-dos windows
telnet mail.probe.com 25
mail from: email@example.com
rcpt to: firstname.lastname@example.org
This is a phishing
Using this method someone can send email to email@example.com without authentication, and phishing this account.
¿Can i resolve this problem of security in my zimbra opensource server?
Thank you very much