how to mitigate mailsploit

if a mail sender encode his sender-adress in from: field in the smtp protocol, the mail transfer agent only check the sender after the unencoded @. in this way protection mechnisms like SPF/DKIM/DMARC are subverted.

Is there are any Mitigation againt this?

From: =?utf-8?b?$  {base64_encode('potus@whitehouse.gov')}?==?utf-8?Q?=00?==?utf-8?b?$  {base64_encode('(potus@whitehouse.gov)')}?=@mailsploit.com"