There is two thing you could do.
When you POST through ajax you could:
<script>
var getEmail;
$('#form').on('submit', function(){
getEmail = $("#emailId").val();
$.ajax({
type: 'POST',
url: 'https://test.com//Action/SavePageOne',
crossDomain: true,
data: { ApplicationAppEmail : getEmail },
success: function(responseData, textStatus, jqXHR) {
var value = responseData.someKey;
},
error: function (responseData, textStatus, errorThrown) {
alert('POST failed.');
}
}).then(function(){
$.ajax({
type: 'POST',
url: 'https://test.com//Action/SavePageOne',
crossDomain: true,
data: { email: getEmail },
success: function(responseData, textStatus, jqXHR) {
var value = responseData.someKey;
},
error: function (responseData, textStatus, errorThrown) {
alert('POST failed.');
}
})
})
return false
})
</script>
Or on you backed of SavePageOne or SavePageTwo you could get the #emailId and cast it there.