MainPage.xaml

<?xml version="1.0" encoding="utf-8"?>  
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:local="clr-namespace:XamarinFormsEmail" x:Class="XamarinFormsEmail.MainPage">  
    <StackLayout>      
        <StackLayout HorizontalOptions="Center" VerticalOptions="Start">      
         <Image Margin="0,50,0,0" x:Name="imgBanner" Source="banner.png" ></Image>      
         <Image Margin="0,0,0,10" x:Name="imgEmail" HeightRequest="150" Source="aws-ses-logo.png" ></Image>      
         <Label Margin="0,0,0,10" Text="Email with AWS SES" FontAttributes="Bold" FontSize="Large" TextColor="#CA6F1E" HorizontalTextAlignment="Center" ></Label>     
         <Entry x:Name="txtTo" Placeholder="someone@example.com"> </Entry>    
         <Entry x:Name="txtSubject" Placeholder="Subject"> </Entry>    
         <Editor x:Name="txtBody" HeightRequest="50" > </Editor>   
         <Button x:Name="btnSend" Text="Send" Clicked="btnSend_Clicked" />      
        </StackLayout>      
    </StackLayout>    
</ContentPage>