Hi Nicolas, > real IP - Exim header > 3ffe:4013:0:4::3 - 3ffe:4013::4::3 > 3ffe:4013:0:4:0:1::3 - 3ffe:4013::4::1::3 These Exim headers really look pretty stupid. > Yes. I don't have this problem with qmail (patched for IPv6). Sendmail is working fine for IPv6 operations, as well (here on a Debian PA-RISC cluster)... --jochen