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Sendmail anti-relay
Posted on 2003-02-22
I have setup sendmail in RH 8, all send and receive email is ok, but I have one questino about anti-relay which is.
Let's say, my RH 8 sendmail sever IP is 192.168.1.1 and other PC IP is 192.168.1.2 which are all in the LAN.
Let's see my setup step first
(1) vi /sendmail.cf --
O DaemonPortOptions=Port=smt
(2) assume I have abc.com this domain, then I vi /etc/mail/local-host-names
(3)add email account by useradd................
With the above setting, I can send and receive email, but
I don't know why I no need to edit /etc/mail/access since
default is don't relay any things except these
localhost.localdomain RELAY
localhost RELAY
127.0.0.1 RELAY
I haven't add 192.168.1.1 RELAY
why sendmail server still accept the mail from 192.168.1.1 ?
Thanks you very much !
Let's say, my RH 8 sendmail sever IP is 192.168.1.1 and other PC IP is 192.168.1.2 which are all in the LAN.
Let's see my setup step first
(1) vi /sendmail.cf --
O DaemonPortOptions=Port=smt
(2) assume I have abc.com this domain, then I vi /etc/mail/local-host-names
(3)add email account by useradd................
With the above setting, I can send and receive email, but
I don't know why I no need to edit /etc/mail/access since
default is don't relay any things except these
localhost.localdomain RELAY
localhost RELAY
127.0.0.1 RELAY
I haven't add 192.168.1.1 RELAY
why sendmail server still accept the mail from 192.168.1.1 ?
Thanks you very much !
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4 Comments
Hi!
Well 192.168.1.1 is the mail server itself, so there is no relaying going on.
Relay is only when someone from another IP connect's to the server and tries to send a mail.
It also allows relay from all computer in same domain.
This is default behaviour.
So if you have DNS setup and records for 192.168.1.1 and 192.168.1.2 and theese are called:
mail.abc.com
wkst.abc.com
Then mail would be accepted from the windows machine allthough it's not in the relay list.
That's all I know.
Regards
/Hans - Erik Skyttberg
Well 192.168.1.1 is the mail server itself, so there is no relaying going on.
Relay is only when someone from another IP connect's to the server and tries to send a mail.
It also allows relay from all computer in same domain.
This is default behaviour.
So if you have DNS setup and records for 192.168.1.1 and 192.168.1.2 and theese are called:
mail.abc.com
wkst.abc.com
Then mail would be accepted from the windows machine allthough it's not in the relay list.
That's all I know.
Regards
/Hans - Erik Skyttberg
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