Bill Owens wrote:
Is it possible that your postfix machine is trying to look up the reverse using ip6.int, rather than ip6.arpa, and as a result not getting any response?
my domain name is parametered for the both reverses. the matter is more why does thunderbird is sending a bad-formed IPv6 address (with "IPv6:" prefix) to postfix ? Note that it was working fine with an older thunderbird version (but forgotten). -- Baptiste SIMON aka BeTa Administrateur systèmes GNU/Linux, Unix, IPv6 | http://www.e-glop.net/ Développement, design système | CNAM - CEANTE - http://ceante.cnam.fr/