Yahoo! Business email: MX, SPF and DKIM

the MX record should point to mx-biz.mail.am0.yahoodns.net as per their article.

For the rest of the information you would be best suited to asking their support staff, at least this way when they tell you the wrong thing you can blame them ;)

Cheers
Andrew

Thanks Andrew, I am working through somebody else and don't have access to do that otherwise I would have taken that route first.    I was hoping somebody else has already done this.  I think my next step is to just ask for the username and password of the account and figure it out on my own.

Yahoo seems to want to control the dns and have you point your name servers to them which I don't want to do.

Yep they always want to control everything ;)

That is pretty standard.

Good Luck
Andrew

I've requested that this question be deleted for the following reason:

I did not get an answer other than what I provided in my question.

Some of the information varies by sets of users, so I would not want to try to get 100% of the information from another party that happens to use Yahoo Small Business. And as Andrew stated, all providers want to you give them control of the DNS, even if you don't really have to.

Check to see if Yahoo has a form where you're supposed to authorize (or not) to transfer your DNS to them. If you fill out the form and specify that you want to maintain control over your DNS but want their service, then they have to give you the information you're looking for. And it's also the only way that you'll get 100% of the information you need correctly.

Thank you masnrock.  My solution has been to talk my client out of using Yahoo.  I spent too much time searching for this and there is apparently no phone number.  The response my client received was

Below is the information you requested for the Yahoo! MX Record:
mx-biz.mail.am0.yahoodns.net    Priority: 10
 
We do suggest resetting your DNS back to Yahoo and adding an A or CNAME record to point your website back to the host servers. I am adding the links below with the steps for this process for your reference.
http://help.yahoo.com/l/us/yahoo/smallbusiness/domains/domainfeatures/advanceddns/advanceddns-01.html
http://help.yahoo.com/l/us/yahoo/smallbusiness/domains/domainfeatures/advanceddns/advanceddns-05.html

My response back is this is too much waste of time.  Going to a different solution.