Open mail relay problem - HELP!

[mgraveney]

We have had our SMTP relay switched off because someone is using our Exchange 2000 server to Spam!
We have checked the default setting for allowing relay and it looked fine and followed the instructions on..

http://www.microsoft.com/technet/tr...chnet/security/prodtech/mailexch/excrelay.asp

to allow relaying from a single computer or block of network addresses but the problem still persists - Can anyone help please!

Exchange 2000 running on Win2K with Sp2.

;-) Regards

 

[petaverde]

Have you ended up on a black list?

If so get them to retest and find out what type of relayed message is getting through.... mailabuse.org have an online test facility...

Geoff

 

[tom11011]

Someone from this group posted this a while back, I thought it was pretty good so I saved it. Here it is:
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To close your open relay on Exchange 2000, do the following.

In System Manger…. Expand Servers, Expand , Expand Protocols, Expand SMTP then right-click “Default SMTP Virtual Server” and select Properties.

On the Access Tab

1) Click Authentication, Ensure that all three options are checked. (Do NOT disable Anonymous as you will not be able to receive inbound mail) – Apply, OK

2) Click Connection, Click the “All except the list below” radio button and leave the list blank. – Apply, OK

3) Click Relay, click the “Only the list below” radio button and leave the list blank. Check "Allow all computers which successfully authenticate to relay, regardless of the list above" – Apply, OK

Next in System Manager

Expand Connectors, If you have the often found “Outbound” connector delete it. You can leave any custom built connectors, but you don’t need any.

Next in System Manager

1) Click Recipients 2) In the right window pane, right-click “Default Policy” then properties 3) On the E-Mail Addresses (Policy) Tab. Make sure that all domains you are handling mail for are listed with an SMTP Entry, if not.. add those needed. – Apply, OK

Next open Services (Start, Settings, Control Panel, Administrative Tools, Services)

1) Stop “Microsoft Exchange Routing Engine” 2) Stop “Simple Mail Transport Protocol” 3) Start “Microsoft Exchange Routing Engine” 4) Start “Simple Mail Transport Protocol”

Following these steps will close your open relay and allow you to receive all inbound mail.

When you have external clients they will have to set their mail programs to authenticate when sending mail.

 

[Xybertron]

Its a tip. You can sort by tips on the previous page. Dan
Microsoft Exchange Support @ Microsoft