A user may have more than one user name with the same email address. By default, Responder does not require that each email address be unique. You can modify the Web.config file to allow duplicate email addresses.

1. Browse to C:\Inetpub\wwwroot\Responder and open Web.config. This file can be edited using a text editor such as Notepad.
2. Look for the following bit of XML.

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   <membership defaultProvider="DatabaseMembershipProvider" userIsOnlineTimeWindow="30"> <providers> <remove name="AspNetSqlMembershipProvider"/> <add name="DatabaseMembershipProvider" type="Miner.Responder.Shared.Security.DatabaseMembershipProvider, Miner.Responder.Shared" minRequiredPasswordLength="5" minRequiredNonAlphanumericCharacters="0" requiresUniqueEmail="false" connectionStringName=""/> </providers> </membership>

3. You will need to modify the requiresUniqueEmail attribute in the DatabaseMembershipProvider line. Set this value to "true" to require unique email addresses. By default, this value is set to "false", and the functionality allows duplicate email addresses.
4. Save and close Web.config.