I can't send any e-mails to firstname.lastname@example.org. Are there problems on your servers? Sorry, this is probably not the best place to post, but it is probably affecting others and thought I should make you aware.
I believe the only way to actually get through to that address is by replying to an email that was sent from it. The rest would be filtered off and sent directly into the ether.
We were having some issues earlier today with the script which handles emails to that address. Should be fixed now, though.