![]() ![]() Domain - Allow all computers in a specific domain to relay emails through this server.Group of computers - Authorize specific computer(s) to relay emails through this server.Use the DNS Lookup button to lookup an IP address for a specific host. Single computers - Authorize one specific machine to relay email through this server.Specify IP(s) of the internal mail server(s) that are allowed to route emails through your mail relay server. Select Only the list below and click Add.ĥ. Right-click on Default SMTP Virtual Server and select Properties.Ĥ. ![]() In the left pane, expand the respective server node. Solution MailEssentials subscription license keys are unique to each major release or product version. Go to Start > Control Panel > Administrative Tools > Internet Information Services (IIS) Manager.Ģ. Overview After renewing your subscription and obtaining a new license key, you apply it in the Licensing section of MailEssentials and get a 'License key could not be verified' error. To prevent this, it is recommended that you specify which mail servers can route emails through this mail relay server (for example, allow only specific servers to use this email relaying setup). If unsecured, your mail relay server can be exploited and used as an open relay for spam.
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