site wide email

I don't know if this is a bug or I am not aware of doing this.

I have changed the site email address on: admin/settings/site-information, but when I am editing or creating a webform the from email address is still the old one. on: [domain]/node/[node id]/webform/emails.

I just want to know if anyone have already got this fixed and working.

Suggestion are welcome.

Thanks,
Anand