I am sending emails from yahoo as explained here: http://help.yahoo.com/tutorials/mmail/mmail/mm_accessother4.html Do you know how to add a SPF record to my domain to add yahoo as a sender? Do you know the IP or domain of yahoo mail server to write one these?: v=spf1 a:mail server domain.yahoo.com ..... ~all or v=spf1 ip4:yahoo email server IP .... ~all