UE4 and Yahoo Web Hosting

Hi there,
I have seen a couple of threads about this topic, but none of them give a clear solution.

I have a client using Yahoo Small Business Web Hosting and I'm trying to get UE4 to work with a Contact Form (contact.php). The form processes, I get my "Thank You" page but don't actually receive the email.

I know this is an issue with how Yahoo is processing the email, but need to know what to do to make it work - or exactly what question(s) I need to ask Yahoo to get the info I need.

There was a post that had the following information:

"To close this thread I'll post the ultimate resolution. As the WebAssist doc states, the settings for host and port can usually be left blank. That is what eventually worked for me on Yahoo hosting. However, when I was initially using those simple settings, I had the email From field set to a random user, not from an email address within my domain. Yahoo doesn't allow an email to originate from other than your domain. So it failed. I assumed the host and/or port was wrong and attempted numerous other values, including those specified in writting on Yahoo's site. The real issue the entire time was my "From" email address. When a Web Assist professional helped me and we went back to blank host/port and an email From address within my domain, all worked."

I have Email Object set to mail in the mail settings and Character set is default - all the fields below that are blank. I have the From email address set as linda 'at' lmphotonh.com which is a valid email address for that domain.

Do I need to have the From email address actually be an at Yahoo email address?

Any helpis greatly apprecated!
Thanks!