otherName.SmtpUTF8Mailbox. According to RFC 8398, the email address should be provided as UTF8String. To enforce the valid representation in the certificate, the SmtpUTF8Mailbox should be provided as follows</p>

<pre><code> subjectAltName=@alts
 [alts]
 otherName = 1.3.6.1.5.5.7.8.9;FORMAT:UTF8,UTF8String:nonasciiname.example.com</code></pre>

<h2 id="Issuer-Alternative-Name">Issuer Alternative Name</h2>

<p>This extension supports most of the options of subject alternative name; it does not support <b>ema