[44net] gw.ampr.org from tunnel system

Recently I saw a header in the DNS robot reply mails that the mail address has changes and the update mails now have to be sent @gw.ampr.org. I changed that in my script, but then I noticed that my system on the IPIP tunnel network cannot send mail there. Of course gw.ampr.org is 44.0.0.1 and there have been issues with reaching that from the IPIP gateway systems, but I thought those were fixed. I have changed my mail config to send the mail via my ISP smarthost and that works, but what is the status on this? Is it supposed to be working, does it work for others? It only affects my gateway on the IPIP tunnel network. From the BGP routed gateway and the radio-connected systems here in the Netherlands there is no problem, and neither from normal internet addresses. Rob