public void setMailFromDomain(String mailFromDomain) {
        this.mailFromDomain = mailFromDomain;
    }
<p>
The custom MAIL FROM domain that you want the verified identity to use. The MAIL FROM domain must meet the
following criteria:
</p>
<ul>
<li>
<p>
It has to be a subdomain of the verified identity.
</p>
</li>
<li>
<p>
It can't be used to receive email.
</p>
</li>
<li>
<p>
It can't be used in a "From" address if the MAIL FROM domain is a destination for feedback forwarding emails.
</p>
</li>
</ul>

@param mailFromDomain
       The custom MAIL FROM domain that you want the verified identity to use. The MAIL FROM domain must meet the
       following criteria:</p>
       <ul>
       <li>
       <p>
       It has to be a subdomain of the verified identity.
       </p>
       </li>
       <li>
       <p>
       It can't be used to receive email.
       </p>
       </li>
       <li>
       <p>
       It can't be used in a "From" address if the MAIL FROM domain is a destination for feedback forwarding
       emails.
       </p>
       </li>
aws-java-sdk-pinpointemail/src/main/java/com/amazonaws/services/pinpointemail/model/PutEmailIdentityMailFromAttributesRequest.java