Solved

Exchange 2007 becomes spam machine when enabling smarthost

Posted on 2011-02-25
3
719 Views
Last Modified: 2012-05-11
OK....here's one for the grownups.

We have a client that's signed up for the mx-logic anti-spam service. Part of their account is outbound filtering and requires the installation of a smarthost. No problem.

The problem is that when I enable the smarthost and disable the normal send connector the server starts sending out buckets of spam.

Malware bytes didn't come up with anything on the server, spybot search and destroy didn't come up with anything. The server isn't a relay but like clockwork, we change the send connector and it starts spamming. Message log
0
Comment
Question by:taiell0
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 15

Accepted Solution

by:
markdmac earned 500 total points
ID: 34987121
Sounds like you are allowing all workstations that authenticate to relay. You most likely have one or more workstations that are infected and are sending spam out via outlook.
0
 
LVL 27

Expert Comment

by:davorin
ID: 34992347
In addition to previous post:
How do you have smtp receive conectors configured?
You can set TLS encryption for client receive connector, so exchange will receive mails from SMTP clients on LAN over 587 port instead of port 25. In this way you should block sending from infected computers.
You can test open relay at www.mxtoolbox.com
0
 
LVL 76

Expert Comment

by:Alan Hardisty
ID: 34996795
Check your network with something like Wireshark to see if you have a machine sending out spam via port 25 to the server.

Check to see if you are an open relay on www.checkor.com

Alan
0

Featured Post

Office 365 Training for Admins - 7 Day Trial

Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies.  Only from Platform Scholar.

Question has a verified solution.

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

Scam emails are a huge burden for many businesses. Spotting one is not always easy. Follow our tips to identify if an email you receive is a scam.
In-place Upgrading Dirsync to Azure AD Connect
This video discusses moving either the default database or any database to a new volume.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the adminiā€¦

752 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