I just did a test FPL via the NL AIS internet tool. EHRD (controlled) DCT SPL (a VOR in the EHAM CTR) DCT EHTX (uncontrolled and in any case closed by now). The only addressee is EHAMZPZX. I assume this ends up at the Flight Information Office at Amsterdam? And they send it onwards to whoever needs the info?
From earlier plans did, I can see that the message is originating from EHWMYJYJ. Is that me personally or is that just a generic "coming from the internet" thing? :-)