Firefox 4 not handling escaped urls properly

I am sending email from my server whose source looks like this:

<a href="http://mydomain.com/myurl?email=my%40my.com">http://mydomain.com/myurl?email=my%40my.com</a>

In all other browsers when I click on the link in the email, it opens to :

http://mydomain.com/myurl?email=my%40my.com

However, in Firefox 4, the link is interpreted as:

http://mydomain.com/myurl?email=my@my.com

This obviously breaks the script at the URL开发者_高级运维. Why does Firefox put the @ sign instead of using the escaped form and how can I make behave as it should?

Edit:

Seems like this is a problem only when Hotmail is used as a client to open mails inside Firefox.

Anyone else know of this issue with Firefox and Hotmail?

Well, if your intention is to open the email client on the OS when you click the link then you should be using mailto in <a href=....> like

<a href="mailto:my@my.com?subjeck=your subject here&body=http://mydomain.com/myurl?email=my%40my.com">Send email</a>

This should handle any in-compatibilty of browser vs. email client.