Default Email Address - Define in site.php not working

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I have made a few sites & up until now the addition of the 2 lines in the site.php for define the default email address have worked but now they do not seem to be.

I change add them so that the address is one that represents the website more than my own and make sure it is all correct but when testing the form they are not sending from this email!

Any ideas?

Rgds,

Gary

garyjhills