TrackEmailClick.cs

public static void TrackEmailClick(HttpContextBase httpContext, EPiServer.Tracking.Core.ITrackingService trackingService)
{
    try
    {
        var email = GetCurrentUserEmail();
        // If you know the users name and/or additional information  
        // like company name it's also possible to associate here
        var userData = new UserData() { Name = email, Email = email };
        var trackingData = new TrackingData<object>
        {
            EventType = "EmailAssociated",
            User = userData,
            Value = "Associated email with current profile: '" + email + "'"
        };

        trackingService.Track(trackingData, httpContext);
    }
    catch
    {
    }
}