Hi, i say that someone is able to bounce a message through my server to local user, it can use the server smtp to delivery to local user but the mail from must be any local user.
Example: on my server i have 20 local users, one of this is pippo@xxxxxxxxx, someone send e-mail through my server using my server smtp and in the from address of e-mail put pippo@xxxxxxxxx it send the e-mail without problem. So all who want do spamming on my local user can do this. How can stop it?
Scot L. Harris ha scritto:
On Fri, 2004-06-25 at 12:23, Franco wrote:
Hi, i have set relay for my server, i have enabled just few ip of my lan to relay and all work fine. The problem is that if anyone from the internet write to a local user and use the smtp of my server it permit the relay. How can i stop this ?! Best regards.
Not sure I understand the question?
If an external mail server sends email to a local user which is located
on your server then it is not relaying. Sendmail accepts the message
from port 25 and if it is a local user then the message is delivered.
Relaying occurs when you connect to an MTA and send a message for
someone that does not reside on that server. In general you do not want
to relay mail, at least not as an open relay (which used to be the
default configuration a long time ago).
If you are saying that someone is able to bounce a message through your server to another destination then you have miss-configured the server.
