Same story Here
I'm a network administrator/director for a non-profit Usergroup/ISP in Houston, Tx. (http://www.hal-pc.org)
We've been having the same problem with them off and on for months. The major difference is that with 15K accounts on our mail server, we spool mail for way more yahoo accounts than most people and when they block us, our mail spool increases into the thousands very quickly and slows our servers to a crawl. I'm sorry to say that the 17 item questionairre is the a form response and not the result of the reg article. Yahoo doesn't care about interoperability (domainkeys) they obviously don't care about customer support and they don't care about bad press. They get plenty of bad press, but it's generally justfied because they pull stuff like this.
I've been through 15-20 email transactions with them where there are three constants:
1. I jump Through their hoops
2. They send me form resopnses that are not applicable to my situation and demonstrate than nobody read my responses.
3. If I pay them, they'll let me send whatever I want.
Their customer service number (866-562-7219) is completely pointless unless you work your way into the premium webhosting queue and their main corporate number (408-349-3300) generally results in a transfer to their customer service number if you don't know the name of someone you need to be transferred to.
I have a feeling that they'll do this until a critical mass of ISPs cannot send email to them at which time:
1. They'll die.
2. Having been in bed with SBC (AT&T now), they'll use the inability of small ISPs to send them email as a selling point for AT&T to further drive small ISPs out of business. and then they'll die.