It should lookup the MX of lists.ubuntu.com and connect there. Whatever the comment of William Grant says, it might be misleading:
[troubadix] ~ > telnet fiordland.ubuntu.com 25 [...] MAIL FROM:<pkern(ät)ubuntu.com> 250 Ok RCPT TO:<email address hidden> 554 <email address hidden>: Relay access denied [...]
It should lookup the MX of lists.ubuntu.com and connect there. Whatever the comment of William Grant says, it might be misleading:
[troubadix] ~ > telnet fiordland. ubuntu. com 25 ät)ubuntu. com>
[...]
MAIL FROM:<pkern(
250 Ok
RCPT TO:<email address hidden>
554 <email address hidden>: Relay access denied
[...]