Yahoo is not delivering emails

Im developing a web application in asp.net mvc (c#) that has a form and when the users submit the form, the data is sent to my boss. For sending the emails I use an smtp server of my own, that works great unless with yahoo accounts. :(

My boss has a yahoo email account, and for some reason yahoo doesnt de开发者_Go百科liver the emails that the webapp sends, not even on the spam inbox... I tested it with gmail and aim accounts and I receive the emails. Its just yahoo that for some reason is blocking my emails.

Do you know how can I solve this? I really need this to work with my boss yahoo account.

Thanks in advance. Juan

It is probably because Yahoo treats these mails as spam. This article provides nice overview of what you should do to avoid that: http://www.codinghorror.com/blog/2010/04/so-youd-like-to-send-some-email-through-code.html