If you use Google Apps for your domain, sometimes you have a "group" setup, such as  This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Mail sent to This e-mail address is being protected from spambots. You need JavaScript enabled to view it is then forwarded to the members of the group, such as  This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

The problem is that when you want to send an email from the info account, Gmail adds the "Sender" header which makes it appear to the recipient as:
"From: This e-mail address is being protected from spambots. You need JavaScript enabled to view it  on behalf of This e-mail address is being protected from spambots. You need JavaScript enabled to view it ".