I've encountered a very strange problem when trying to reply to e-mail via my Yahoo Web Mail from a family member's computer.

She received an e-mail from a client who is using Microsoft Outlook. When I receive the message it looks perfectly fine in my browser and I can read it.

However, when I try to reply to the e-mail the quoted text looks as such:

> #yiv9181642880 p.yiv9181642880msonormal1114, #yiv9181642880
> li.yiv9181642880msonormal1114, #yiv9181642880
> div.yiv9181642880msonormal1114
>       {margin-right:0in;margin-left:0in;font-size:12.0pt;}
> #yiv9181642880 p.yiv9181642880msoacetate1114, #yiv9181642880
> li.yiv9181642880msoacetate1114, #yiv9181642880
> div.yiv9181642880msoacetate1114
>       {margin-right:0in;margin-left:0in;font-size:12.0pt;}
> #yiv9181642880 p.yiv9181642880emailquote1114, #yiv9181642880
> li.yiv9181642880emailquote1114, #yiv9181642880
> div.yiv9181642880emailquote1114
>       {margin-right:0in;margin-left:0in;font-size:12.0pt;}
> #yiv9181642880 p.yiv9181642880msochpdefault1114,
> #yiv9181642880 li.yiv9181642880msochpdefault1114,
> #yiv9181642880 div.yiv9181642880msochpdefault1114
>       {margin-right:0in;margin-left:0in;font-size:12.0pt;}
> #yiv9181642880 p.yiv9181642880msonormal53, #yiv9181642880
> li.yiv9181642880msonormal53, #yiv9181642880
> div.yiv9181642880msonormal53
>       {margin-right:0in;margin-left:0in;font-size:12.0pt;}

It's the strangest thing. It doesn't happen with all e-mails except this particular one. At a glance it almost looks like raw CSS code that's being displayed, but I really can't understand why.

So far I have tried the following:

1. Try a different browser, both IE11 and Google Chrome
2. Check the browser encoding settings
3. Check Yahoo Web Mail's encoding/font settings

My only other guess is that the client used some weird font or formatting on the e-mail that is throwing the message body out of sync. Unfortunately for my family member, she is a contractor working with a medium-sized company that refuses to provide her with a domain e-mail address, so she is forced to conduct business this way. Simply asking the sender to use a more widely supported font wouldn't be an acceptable solution here.

Any thoughts?