Hi, I run a sendmail mailserver at home together with a sixxs IPv6 tunnel etc. Incoming mail can pass over IPv4 or IPv6 just fine. For my outgoing IPv4 mails I have to use my ISPs smtp gateway (using the SMARTHOST directive in sendmail). For IPv6 I would like to use normal smtp behavior with direct connection to the target mail server (if an IPv6 mailserver is available). Using the SMARTHOST directive all my outgoing mails go through the ISPs smtp gateway so I need to split traffic depending on if the destination mailserver has IPv6... Is this possible? Cheers, /Joakim