Solved

Security against sending spam

Posted on 2006-11-14
6
186 Views
Last Modified: 2010-03-06
Hi!

How am I secured against that my Exchange server sending out spam to the world?
How can I control that this doesn't occur? Can I know when it occurs (before anyone complains, if so)?

We using a pop3 parser for delivery TO Exchange from our ISP (and please leave that so, that's our choice).
Exchange are sending the mail directly,  not through smtprelay.
0
Comment
Question by:dingir
  • 2
6 Comments
 
LVL 4

Expert Comment

by:Arath
ID: 17936828
Make sure that your mailserver does not allow relaying.
Thats the main point. IF it does not allow realying, then it can't be used by external to send spam.
0
 
LVL 5

Accepted Solution

by:
simonpainter earned 250 total points
ID: 17936887
You may want to invest in either a software solution or an appliance to filter your outbound mail in the same way that you could filter inbound mail... such appliances look at an SMTP stream and don't care which direction it is going in.

Alternatively you could use firewall rule to ensure that only your exchange server can send smtp traffic and that it can only send to your ISP's relay server. That way your ISP is likely to notice spam being sent out by you and cut you off until you rectify the problem. You will also prevent malicious code on PC's from sending out mail through their own onboard smtp servers.
0
 
LVL 1

Author Comment

by:dingir
ID: 17978108
Arath: Thanks' I don't think that my Exchange is configured for Relaying. Is there a way to check? I haven't specifically configured it that way :-).


Simonpainter
I'm not afraid that anyone gets into our network and sending spam. Also the use of port 25 already is restricted to the mailserver 8-). I was more out for the risk that Exchange itself starting to send spam. In case of misconfigured or hacked mailheaders making exchange believe anything else?! Maybe that doesn't work that way? I think that should be a really major problem before our ISP telling us that we sending out SPAM -- If that would be the case, that should be appearable at used bandwith/connections in the firewall.
0
 
LVL 4

Assisted Solution

by:Arath
Arath earned 250 total points
ID: 17980203
http://www.amset.info/exchange/spam-cleanup.asp

Here you find info on where to configure and how to test if your server relays.
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…
How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…
how to add IIS SMTP to handle application/Scanner relays into office 365.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question