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Step 1
Open the Microsoft Exchange Server Administrator utility. The access path to the utility will vary depending on the installation procedure used to set up your Exchange Server.
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Step 2
Click the "Connections" icon in the left-side navigation pane of the Microsoft Exchange Server Administrator window for the server you want to administer. Double-click the Internet Mail Service icon in the right-side pane. This opens the Properties window.
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Step 3
Click the "Connections" tab in the Properties window, then click the "Advanced" button. This opens a configuration window.
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Step 4
Set the number for "Max No. of Inbound Connections" to a high number such as 100. You may need to reset it to higher values until the problem is resolved.
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Step 5
Close all open Exchange Server Administrator program windows to complete the process.













