Hello,
I want to ask my question with a example scenario;
i telnet to my exchange server --> telnet x.x.x.x 25 OR telnet mail.MYDOMAİN.COM 25
and i write commands to send an e-mail to somebody@MYDOMAİN.COM
when i write
Scenario1
HELO
mail from:somebody@MYDOMAİN.COM
rcpt to: somebody@gmail.com ----> When i write this command, the server responds "Unable to relay"
There is no problem in this example scenario that i have explained above.
Scenario2
The main problem is shown below;
HELO
mail from: somebody@MYDOMAİN.COM
rcpt to: somebody2@MYDOMAİN.COM
data
SecurityTest mail.
Queued for mail delivery.
There is a problem here. An intruder can send fake e-mails from the exchange server to the victim.
In Exchange 2003,i can configure the server. But in Exchange 2007 and 2010 i can't exactly configure the exhange server. I want to close this relay issue for all IPs or domains. Can it be done or Will it cause a problem when it is done.? How can i configure the Exchange 2007/2010 server to prevent this operation for all domains.?
Thanks so much,
with all respect.