Always authentication failure in Spring security 4.2 - spring

Question

I am trying to implement one simple user authentication by Spring Security in Spring MVC model but I am constantly getting "Bad credentials" even if I am providing correct credentials .
Below are my files. Can someone please suggest what am I missing?
Security.xml:
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/security
https://www.springframework.org/security/spring-security-4.2.xsd">
<http>
<csrf disabled="true"/>
<intercept-url pattern="/login*" access="ROLE_USER"/>
<form-login login-page="/" default-target-url="/login" authentication-failure-url="/"/>
</http>
<authentication-manager>
<authentication-provider>
<user-service>
<user name="rishavraj#gmail.com" password="123456" authorities="ROLE_USER" />
</user-service>
</authentication-provider>
</authentication-manager>
</beans:beans>
Controller.java:
#RequestMapping(value = "/login", method = RequestMethod.POST)
public ModelAndView Login(#RequestParam Map<String, String> reqvar) {
System.out.println("login");
ModelAndView form = new ModelAndView("Index");
return form;
}
#RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView Index() {
System.out.println("Index");
ModelAndView form = new ModelAndView("Index");
return form;
}
Index.jsp:
<c:if test="${SPRING_SECURITY_LAST_EXCEPTION !=null}">
<div class="alert alert-danger fade in">
×
<strong> Wrong Email or Password </strong>
<h4> Caused by :
${sessionScope["SPRING_SECURITY_LAST_EXCEPTION"].message}
</h4>
</div>
</c:if>
<form action="/Mail/login" method="post">
<div class="form-group">
<label for="inputUserName">Email</label>
<input class="form-control" placeholder="Email ID" type="text" id="inputUserName" name="Email"/>
</div>
<div class="form-group">
<label for="inputPassword">Password</label>
<input class="form-control" placeholder="Login Password" type="password" id="inputPassword" name="password"/>
</div>
</div>
<div class="modal-footer">
<button type="submit" class="btn btn-primary">Login</button>
<button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>`
</div>
</form>