It could be even esier.. He could change his "Mail address" configuration in outlook/eudora/Kmail/etc..
The only solution that cames to my mind is to use GPG key to send signed mails.
Salutte
hi,
How i can prevent a user to send mail on behalf of an other user in the same domain. I will try to explain in example;
I have a domain named " test.com". There are two users named xxx and yyy. If i am a bad gay i can do this;
# telnet smtp_server_ip 25
mail from: [EMAIL PROTECTED]
250 ok
rcpt to: [EMAIL PROTECTED]
250 ok
data
354 go ahead
you are kicked out!!!
.
250 ok 1139401722 qp 10908
So i wrote the email on behalf of xxx user to yyy user. If i am able to smtp auth in the same domain this problem will not occure.
How i can solve this problem ?
--
Erol KAHRAMAN
System Network Administrator
