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Block fake "From: " emails

Posted: Fri Jan 11, 2019 12:08 pm
by 7224jobe
Hello everybody,
I read and applied some antispam / antispoofing suggestions from zimbra wiki, but there is a spoofing situation that I can not still block. Here is an example:

Code: Select all

root@remoteserver: telnet 25

helo spamtest
250 2.1.0 Ok
250 2.1.5 Ok
354 End data with <CR><LF>.<CR><LF>
From: User B <>
To: User A <>
Subject: Please reply!!!

Reply to me!

User A in his Zimbra webmail sees a mail from "User B", only if he moves his mouse cursor over "User B" label can notice that the email address is "" instead of "". Even if he replies to the email only "User B" label appears.
So is there a way to enforce a match between MAIL FROM: telnet command and "From:" mail header?