alt Hacker NewsA user agent SHOULD NOT send a From header field without explicit configuration by the user, since that might conflict with the user's privacy interests or their site's security policy.
A user agent SHOULD NOT send a From header field without explicit configuration by the user, since that might conflict with the user's privacy interests or their site's security policy.
You might want to clarify that you are quoting the referenced standard so it doesn’t read like an opinion.