Microsoft Exchange allows you to restrict the IPs that are allowed to deliver email to it. Because spammers might have cached the IP address of your mail server, it would be a good idea to only allow email from SpamTitan Cloud IP addresses to force all email through our filter.

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There are three SpamTitan cloud server clusters.  The cluster you are using will determine which IP addresses you need to use.  The easiest way to determine which cluster you are using is to look at the MX records for your domain.  this is easily done at www.mxtoolbox.com.


If your MX records are cloud1.spamtitan.com and cloud2.spamtitan.com then use these IP addresses:


The SpamTitan Cloud server IP addresses are:


FQDN                            IP Address
-------------------------------------------------------

cloudb.spamtitan.com 198.20.73.147
cloudc.spamtitan.com 198.20.89.94
cloudd.spamtitan.com 96.127.141.203



If your MX records are cloud3.spamtitan.com and cloud4.spamtitan.com then use these IP addresses:


FQDN                            IP Address
-------------------------------------------------------

cloude.spamtitan.com 107.6.152.251

cloudf.spamtitan.com 108.178.61.211


If your MX records are cloud5.spamtitan.com and cloud6.spamtitan.com then use these IP addresses:


FQDN                            IP Address
-------------------------------------------------------

cloudg.spamtitan.com 52.10.98.167

cloudh.spamtitan.com 52.32.254.113

cloudi.spamtitan.com 52.26.55.167




Microsoft Exchange 2013

Exchange 2013 uses a web based interface called Exchange Admin Center (EAC). From the EAC, do the following:

1. Select "mail flow" -> receive connectors.

2. Select "Default Frontend [servername]" and click the edit icon (looks like a pencil).

3. On the "Default Frontend [servername]" select the "scoping" option and then select the default IP address range (0.0.0.0-255.255.255.255) and click the remove icon (looks like a minus symbol to the right of the edit icon).

4. Click on the add icon (looks like a plus symbol) to add the SpamTitan Cloud IP addresses one at a time.

5. After all SpamTitan Cloud IP addresses have been added, click on the save button.

Microsoft Exchange 2007 & 2010


1. Open the Exchange Management Console.

2. Go to Server Configuration -> Hub Transport -> Default Receive Connector -> Properties -> Network tab.

3. You will see a section that says "Receive mail from remote servers that have these IP addresses".

4. Remove the default rule for 0.0.0.0 to 255.255.255.255.

5. Add the SpamTitan Cloud IP addresses one entry at a time.

6. Stop and restart the MSExchangeTransport service.

Microsoft Exchange 2003

To do this using the Exchange System Manager:

1. Click Start, point to Programs, point to Microsoft Exchange, and then click System Manager.

2. In Exchange System Manager, expand the following object:

Servers -> [ Your_Exchange_Server_Name ] -> Protocols -> SMTP

3. Right-click the virtual SMTP server where you want to restrict inbound IPs, and then click Properties.

4. Click the Access tab, and then Connection...

5. Add the SpamTitan Cloud IP addresses


6. Enable the "Only the list below option" and add the SpamTitan Cloud IP addresses


7. Restart Exchange to activate your changes.