I had a problem with my set up a few days ago;
An email notification was coming into me (administrator) when sites were added but not being sent to the 'linkers' for either link confirmations or modification notifications.
I posted here and Eliot helped but I eventually thought I'd fixed it by changing the sendmail from /usr/sbin/sendmail to /usr/lib/sendmail. This seemed to work.
However when I re-tested today I'm back to square one - mail to administrator, none to linker.
HELP! I'm confused.
Cakey
PS If you could also take a look at my post of yesterday "(CSS and templates? (for a confused newby)" it would also be appreciated.