?
Solved

Security against sending spam

Posted on 2006-11-14
6
Medium Priority
?
199 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
4 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 1000 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 1000 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

Free tool for managing users' photos in Office 365

Easily upload multiple users’ photos to Office 365. Manage them with an intuitive GUI and use handy built-in cropping and resizing options. Link photos with users based on Azure AD attributes. Free tool!

Question has a verified solution.

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

This article explains how to move an Exchange 2013/2016 mailbox database and logs to a different drive.
Disk errors can be the source of sundry problems for the Exchange server, the most common one being that the database fails to mount.
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…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

599 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