All complaints and abuse-reports should be sent to: firstname.lastname@example.org as it is our official contact-address for most of the hosted mail-domains .
The same goes for whitelisting and removal from our private blocklist, the email@example.com is not as heavily filtered and should work for most senders.
Snailmail should be addressed to:
Sint Annalaan 1
6214 AA MAASTRICHT
 For those unable to use DIG or WHOIS; Too bad.
Kudos and thanks to antenna.nl [Networking for Progress,
not for Profit!] for putting up with us since 1999 and still going ;)