The e-mail address of the currentl logged in user should be available in any module control which inherits from PortalModuleBase as follows:

UserInfo.Email

Unless you need to pass the e-mail address to someplace outside of the DNN installation, I would not pass it in the query string but rather let the module control to which you are navigating obtain it on its own by referencing UserInfo.Email.  If you do need to pass the e-mail address outside of the DNN installation, please describe how your're building the query string.  Is this in a custom module you are writing or in a hard coded link in a core or third party module?

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

The core navigation/menu controls do not support dynamic tag or token replacement in the link url specified in the page settings.  Perhaps there is a third party navigation/menu control that supports this but a quick look on Snowcovered did not turn up anything. I believe that this would have to be accomplished within a module or skin object.  It should not be very difficult to create a simple skin object to provide this function, but it would not be part of the standard menu.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner