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?

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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.