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More Open Relay problems

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More Open Relay problems - 25.Apr.2003 11:35:00 PM   


Posts: 3
Joined: 25.Apr.2003
From: Fort Worth
Status: offline
Hi, I am an Exchange newbie. I have looked through the posts here and found several things i can do to block open relay. However, they do not seem to work. I tested this from a remote network. I used Outlook Express to send an e-mail through my server at work. I used a bogus e-mail address. I used Administrator for the login name with a bogus password. I opened Outlook and got the invalid username and password when connecting to the server(expected this). I tried to send a message with this bogus info to a Hotmail account I have. The message went through! (did not expect this) I am thinking this should not happen.

My network consists of a Corporate office with 20 users. I have 2 field offices with 5 users each. All offices have a DSL connection. The field offices connect to their mail with Outlook express. The Corporate office uses Outlook XP.

Things I have done to try and secure this server:

1> Unchecked the box under "Address Space" in the external SMTP connector.

2> Went to that website that checks for open relay. It said that I was secure.

3> Tried the Telnet test. I failed that. It gave an error 250.

BTW: I am one of the many that have been slammed by this problem. Yesterday I had over 250,000 messages in the bad mail folder. It took all day to get that stuff deleted. The queues are restored to normal operation at the moment, but I am afraid this could change again at any moment.
Post #: 1
RE: More Open Relay problems - 29.Apr.2003 1:50:00 PM   


Posts: 30
Joined: 20.Feb.2003
From: the Netherlands
Status: offline
Maybe this would help, I've got it from a news group

Some people don't realize that there are also a connector configuration
that could allow relaying. In the properties for the SMTP Connector for
the routing group, in the address space tab there's a check box that
states: "Allow messages to be relayed to these domains"
Since this is a SMTP connector to the "world" (AKA Internet Mail
Service), the "these domains" that the check box refer to are basic
everything (*).
The connector's setting overrides the SMTP Virtual Server settings....So
if you don't want to relay, make sure the box is not checked and that
the SMTP Virtual Server is also not allowing relaying.

(in reply to Shiftaltumlock)
Post #: 2

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