Recently I've upgraded our SP2010 farm to SP2013. When sharing sites or others objects with someone, there is a "send e-mail invitation" check-box and it works fine on SP2010 visual sites but it is not working at SP2013 visual sites. I've found a thread like this. Does really SP2013 use logged on users credentials to send e-mail? Is there any option to send invitation e-mail using farm account like SP2010 does?
Edit: It can be true. When I logged on with farm account I am able to send e-mail invitation but when I logged on with my personal account I can not. Is there any document about this?