Coś nam serwer listy na IPv6 nie odpowiada :-) $ host -t mx pl.ipv6tf.org pl.ipv6tf.org mail is handled by 10 plum.ipv6.man.poznan.pl. $ host -t aaaa plum.ipv6.man.poznan.pl. plum.ipv6.man.poznan.pl has address 2001:808::2 $ telnet 2001:808::2 25 Trying 2001:808::2... telnet: connect to address 2001:808::2: Connection refused telnet: Unable to connect to remote host