title: Assign GMail Address to another Domain
body: <p>I have an existing GMail email address:</p>
  
  <pre><code>    xxx@gmail.com
  </code></pre>
  
  <p>I have a Firebase Account set up on this email address, which I use to do Firebase Authentication. It works perfectly, and when my app logs in, verification emails are sent to the users via this email address.</p>
  
  <p>I also have a registered domain name with <a href="http://www.1and1.com" rel="nofollow noreferrer">1&amp;1</a>:</p>
  
  <pre><code>    www.yyy.com
  </code></pre>
  
  <p>1&amp;1 also provides a service to create an email address using the domain name.  I have created the following email address:</p>
  
  <pre><code>    admin@yyy.com
  </code></pre>
  
  <p>I would like to mask my Gmail Email (<code>xxx@gmail.com</code>) with the <code>admin@yyy.com</code> email address. </p>
  
  <p>1&amp;1 allows all email sent to <code>admin@yyy.com</code> to be forwarded to <code>xxx@gmail.com</code>, which I can use.</p>
  
  <p><strong>Question</strong></p>
  
  <p>How do I get emails sent from <code>xxx@gmail.com</code> (e.g. firebase-authentication verification email), to appear as <code>admin@yyy.com</code>?</p>
  
  <p>I did see in GMail, that you can create a business account (<code>settings -&gt; customize addresses</code>), which may provide this functionality. However a business account is not free, and I have a limited budget already exhausted on domain names and server costs. Is there a free way to do this? </p>
  
  <p>Any advise appreciated.</p>
  
  <p>UPDATE</p>
  
  <p>The <a href="https://www.youtube.com/watch?v=SP-81LI-mw0" rel="nofollow noreferrer">following tutorial</a> explains how to set up another email address (e.g. <code>admin@yyy.com</code> with your GMail address). It allows emails sent and received to appear as <code>admin@yyy.com</code>.</p>
  
  <p>I however, need Firebase-Authentication to send its emails as <code>admin@yyy.com</code>. Is this possible?</p>
  
  <p>UPDATE</p>
  
  <p><a href="http://www.brandrevive.com/how-to-use-gmail-for-your-1and1-email/" rel="nofollow noreferrer">This tutorial</a> explains how to set up linking accounts. It seems to work with sending and receiving emails. Just need to check if when Firebase sends an automated email, if it uses the correct email address.</p>
  
  <p>UPDATE</p>
  
  <p>Firebase sends the email from its own email address. </p>
  
  <pre><code>noreply@zzz-223560.firebaseapp.com
  </code></pre>
  
  <p>So I guess this is adequate. I am happy with the above solution.</p>