does my mail server allow rely

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D

douha-it



i have exchange 2010 sp1

i setup the accepted domain as "mydomain.com"

and i have 3 receive connector "client, default,custom" configured as

client:

accept port 587

authentication: TLS, Basic, Integrated

groups: exchange users

-----

default:

port:25

authentication: TLS, Basic, Integrated, exchange server authentication

groups: exchange users, servers, legacy servers

----

custom:

default:

port:25

authentication: TLS

groups: anonymous

----

is there is something wrong with this configuration? because i receive mails addressed to outside recipient or blank recipient

like:

From: Laptop offer <computers.eg@gmail.com>
To: <Sales@confiance-eg.com>
Content-Type: multipart/related;

and

From: candy <candy@cargotraveler.com>
To:
Subject: Good

and i test the open relay on my server "http://verify.abuse.net/cgi-bin/relaytest"

and it say
Relay test 6

<tt>>>> RSET</tt>
<tt><<< 250 2.0.0 Resetting</tt>
<tt>>>> MAIL FROM:<spamtest@mydomain.com></tt>
<tt><<< 250 2.1.0 Sender OK</tt>
<tt>>>> RCPT TO:<securitytest%abuse.net@mydomain.com></tt>
<tt><<< 250 2.1.5 Recipient OK</tt>

Hmmn, at first glance, host appeared to accept a message for relay.

THIS MAY OR MAY NOT MEAN THAT IT'S AN OPEN RELAY.
 
R

ronnypot



Hi,

What Ip addresses have you configured for the anonymous connector?

Regards Ronny
 
L

Leif Pedersen [MVP]



Hi,

The above does not tell you that your server is an open relay.

The mails you receive could be for you - you are just addressed in the CC or in the BCC filed.

You can use another test to make sure that you are not relaying. Use telnet as described here:

http://technet.microsoft.com/en-us/library/aa995718(EXCHG.65).aspx

Send an e-mail from another company to yet another company and see if you are allowed to do this - if you are allowed you are relaying.

Leif
 
D

douha-it



THANKS ALL,

i use internal ip for this connector "my server published through ISA"

for the telnet i run cmd

>telnet

>set localecho

>EHLO yahoo.com

MAIL FROM:<medhat_mamdouh16@yahoo.com>
500 5.5.1 Unrecognized command
MAIL FROM:<sender@domain.com>
250 2.1.0 Sender OK
RCPT TO:<recipient@remotedomain.com>
550 5.7.1 Unable to relay

why telnet doesn't accept the first order and accept the second?

is this the only way to test open relay?

if i delete the anonymous connector is it mean that i would not receive mail from external server like yahoo.com, hotmail.com, etc?
 
G

Gen Lin



Hi,

why telnet doesn't accept the first order and accept the second?

500 5.5.1 Unrecognized command.

It happens if you typed the wrong command. For example, you mistyped "MAILFROM" and it is a wrong command. So you use "Backspace" key to delete the wrong command and type in the new one. This will also cause the error "500 5.5.1 Unrecognized command." You must start a new line to input the command.
is this the only way to test open relay?

You can use a relay tool to test it. Please download it from my skydrive:

http://cid-2d68430fc8d84837.office.live.com/self.aspx/Tools/Relay.exe

In the Recipient section, please type in your external mail address such as hotmail. If you can receive the mail, your exchange server should be opened for relaying.

if i delete the anonymous connector is it mean that i would not receive mail from external server like yahoo.com, hotmail.com, etc?

Yes. If your exchange server is facing Internet, you must have the anonymous connector to receive the Internet mails.



 
D

douha-it



thanks all,

i used the tool"relay.exe" and i didn't receive the mail on my external mail

my exchange server is 1 server behind ISA and without edge
 
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