I want create urgent "WITHE LIST" for some Domains that matter,my email adress is "liuscon@yahoo.it"
server in coming(POP3)

op.mail.yahoo.it
server go out (SMTP): SMTP.mail.yahoo.it
i want my MAILER (That i don't Know) send at my ISP something like this:
"VERIFIED OKAY TO RECEIVE ALL EMAILS FROM ..... THOSE DOMAINS!
How i do that ? I have much urgency if someone know something please answer!
thank you
Luciano