sendmail as configured by a fresh install binds its listening port to the IPv4 local address, but does not bind a listening port to the IPv6 local address: warthog>netstat -ta | grep 'smtp\|submission' tcp 0 0 localhost.localdomain:smtp *:* LISTEN However, the /etc/hosts file is installed with only an IPv6 local address contained therein: # Do not remove the following line, or various programs # that require network functionality will fail. ::1 localhost.localdomain localhost And there was no IPv4 line. This means that programs that want to talk to the SMTP port on the local host can't because the /etc/hosts file says to use IPv6, but sendmail is listening on IPv4.
This is a dup of bug 211800 Tobias
Fedora Core 5 and Fedora Core 6 are, as we're sure you've noticed, no longer test releases. We're cleaning up the bug database and making sure important bug reports filed against these test releases don't get lost. It would be helpful if you could test this issue with a released version of Fedora or with the latest development / test release. Thanks for your help and for your patience. [This is a bulk message for all open FC5/FC6 test release bugs. I'm adding myself to the CC list for each bug, so I'll see any comments you make after this and do my best to make sure every issue gets proper attention.]
*** This bug has been marked as a duplicate of 211800 ***