You most likely received an email from someone requesting you to verify yourself.
This email was sent to you automatically from someone you have recently
emailed. They are using the new Mail Unknown software to block spam or
any Unknown emails.
Before your original email can be delivered to them you must reply to the verification email as instructed
in the email. When the person receives your reply they can authorize or block you from sending them email.
If they authorize you as an email sender they want to receive email from, your original email and all future emails you
send to them will be delivered to them as normal.
If they block you, your original email and all future emails you send
will not be delivered to their email software.
