Very few mail servers allow you to that. Once you add sender authentication, it generally comes with sender authorization.
>Besides, the fact that your domain requires a password is only meaningful to you
Almost all SMTP servers are locked down now, most requiring authentication. Those that aren't get blacklisted pretty quickly.
SPF tells you that the sender is authorized to send on behalf of that person.
It solves 99.9% of the issue.
Very few mail servers allow you to that. Once you add sender authentication, it generally comes with sender authorization.
>Besides, the fact that your domain requires a password is only meaningful to you
Almost all SMTP servers are locked down now, most requiring authentication. Those that aren't get blacklisted pretty quickly.
SPF tells you that the sender is authorized to send on behalf of that person.
It solves 99.9% of the issue.