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Knowledge Base Exchange Server Toolbox


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How can I limit the receive connections for Microsoft Exchange?

  Open powershell and type: Set-ReceiveConnector -identity "<IDENTITY>" -MaxInboundConnection 20

 The MaxInboundConnection parameter specifies the maximum number of inbound connections that this "Receive Connector" serves at the same time. The default value is 5000. The valid input range for this parameter is 1 to 2147483647. To disable the inbound connection limit on a "Receive Connector", enter a value of unlimited.

  Open powershell and type: Set-ReceiveConnector -identity "<IDENTITY>" -MaxInboundConnectionPerSource 10

 This parameter specifies the maximum number of inbound connections that this "Receive Connector" serves at the same time from a single IP address. The default value is 100. The valid input range for this parameter is 1 to 10000. To disable the inbound connection per source limit on a "Receive Connector" enter a value of unlimited.

How do I update ClamAV signatures?
Or is this done automatically?

The signaturs of ClamAV are updated automatically every 3 hours by the "Exchange Server Toolbox" service.
You may trigger an update manually in "Exchange Server Toolbox" in "Anti Virus Options".

How can I see which mailboxes the "Exchange Server Toolbox" recognizes for licensing.

The "Exchange Server Toolbox" considers all user mailboxes on the exchange server but without room and device mailboxes.
Please goto "About" page in ExchangeServerToolbox to see how many mailboxes are available.
You can identify which and how many mailboxes the "Exchange Server Toolbox" considers by sending an Lightweight Directory Access Protocol (LDAP) query.
To do so, open "Active Directory users and computers" on the server and right-click on your domain. Select find from the context menu and select "Custom Search" in the "Find:" drop down option.
There you have to select the Advanced tab, paste the following query into the "Enter LDAP query:" field and press Find Now:


What when the demo version of the "Exchange Server Toolbox" expires?

In this case the "Exchange Server Toolbox" will start sending notification mail to administrator accounts and after some time it will stop processing rules including anti-spam and anti-virus rules.

Is the licence of "Exchange Server Toolbox" restricted to a number of mailboxes or is the license for one Exchange Server?

The number of mailboxes available AND installations per Exchange Server are depending on your "Exchange Server Toolbox" license.
There are licenses that reach from up to 10 mailboxes up to an unlimited amount of mailboxes.
For more information on different "Exchange Server Toolbox" Editions and license offers refer to:

Although I have purchased a full version of "Exchange Server Toolbox", it still shows "UNREGISTERED" in the window title. Why?

There are 3 possible reasons why "Demo version" still shows up:
1. You did not download and install the full version from the URL you received after the purchase.
2. You have accidentally installed the trial version again. (Have you been asked for a installation key?)
3. You have installed the full version to a different folder than the trial version, which is now still on your disk.

How do regular expressions work in the "Exchange Server Toolbox"?

The "Exchange Server Toolbox" uses .Net regular expressions with the options IgnoreCase and Singleline set to true.
Please don't use ^ or $ because the Multiline option is not set.
A tool for testing .NET regular expressions can be found here:

I got an "unable to relay" error on using the auto reply rule action. How can I solve this problem?

When the "Exchange Server Toolbox" tries to send auto reply messages, it uses the Exchange Server to send these mails over SMTP. Since by default the Exchange Server rights are restricted, the "Exchange Server Toolbox"may not be allowed to do this. Therefore you have to configure your Exchange Server to allow the "Exchange Server Toolbox" (i.e. localhost) to send mails via Port 25 or 587.

I installed the tiral version of the software. I have purchased the full version.. What shall I do?

Please run the setup of the licensed full version.
Please do not uninstall the previous installed trial version.
All settings will be retained.

Is the administration interface of the EST only used on the Exchange or can it be installed on any client in the network?

No, unfortunately this is not possible at present. The EST administration interface is only available on the Exchange Server.

Unfortunately I cannot get the AVG virus scanner to detect the test virus. Do you have experience which settings I still need to change? Otherwise I like the program very much, but I would not like to change the virus scanner.

General settings for each virus scanner that you want to use with "Exchange Server Toolbox" or "SmartPOP2Exchange" are - If a virus is found (files and archives), no user interaction (asking) may be required. Select "Delete file" or "Rename/Move file". - Disable any scanning of POP3/IMAP and SMTP protocols. This option is usually described as "Scan inbound/outbound email".

You can also use the integrated ClamAV virus scanner in addition to your own.

A certain, or some e-mails are sorted out as spam. Why is this?

The results of the integrated SpamAssassin are written in the header of the mail, just like any other SpamAssassin. If you right-click on the mail in your Outlook and select "Message Options", a dialog appears in which you can view the Internet headers of the mail.
There you will find the spam report, which gives information about which rules have been applied to this mail:
X-Spam-Checker version: SpamAssassin 3.1.7 (2006-10-05)
     * on server1.intranet.jam-software.com
     * at Wed, 09 Apr 2008 15:56:40 +0200
X-Spam status: No, hits=1.0, required= 3.6, autolearn=no
X-Spam Report: * 0.5 HTML_40_50 BODY: Message is 40% to 50% HTML
     * 0.0 HTML_MESSAGE BODY: HTML included in message
     * 0.0 BAYES_50 BODY: Bayesian spam probability is 40 to 60%
     * [score: 0.5077]
     * 0.2 HTML_TITLE_EMPTY BODY: HTML title contains no text
     * -2.0 SP2E_BodyWordWLRule BODY: SP2E_BodyWordWLRule
     * 2.0 RCVD_IN_SORBS_DUL RBL: SORBS: sent directly from dynamic IP address
     * [ listed in dnsbl.sorbs.net]
     * 0.0 RCVD_IN_PBL RBL: Received via a relay in Spamhaus PBL
     * [ listed on zen.spamhaus.org]
     * 0.3 URIBL_GREY Contains to URL listed in the URIBL greylist
     * [URIs: googlepages.com]