We've been having trouble sending to *@yahoo.com Getting the infamous 421 Message from (x.x.x.x) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html. When I follow the referred link I get to http://help.yahoo.com/l/us/yahoo/mail/original/abuse/abuse-60.html, which then points you to this URL: http://help.yahoo.com/fast/help/us/mail/cgi_defer which is supposed to be a form. Sadly, that link loops you back to the Yahoo mail login page. Once you login your choices are quite limited and are for basic E-mail help. I've tried contacting yahoo through those links but I get a canned reply. It's been over a month of consistent deliverability issues to Yahoo and we're not one step closer to solving the problem. The one thing I did notice is when I modified SPF to include the IP address instead of the domain of the deferred MTA, E-mail would get through, but only for a few days then it was back to deferral. I've read the older posts on NANOG and various gripes about Yahoo greylisting on google but all the leads have come to a dead end. Does anyone know an interactive yahoo contact they could share with me? Thank you, Justin Wilson