While testing something completely different, I noticed that a newly installed test machine didn't send any mail:
Jan 20 11:45:27 vhrstest postfix/pickup[9992]: fatal: could not find any active network interfaces Jan 20 11:45:27 vhrstest postfix/master[12458]: warning: process /usr/lib/postfix/pickup pid 9992 exit status 1 Jan 20 11:45:28 vhrstest postfix/master[12458]: warning: /usr/lib/postfix/pickup: bad command startup -- throttling No IPv6 involved, two active interfaces (eth0 and lo), Postfix 2.8.7 on CentOS 6.2. Configuration information (single instance setup): alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases config_directory = /etc/postfix inet_interfaces = all mydestination = vhrstest.example.com, localhost myhostname = vhrstest.example.com mydomain = example.com mynetworks = 127.0.0.0/8 relayhost = [mailrelay.example.com]:25 smtp_tls_security_level = may smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache IP/link information: root@vhrstest:~# ip a l 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 1c:6f:65:92:a6:13 brd ff:ff:ff:ff:ff:ff inet 172.16.12.10/24 brd 172.16.12.255 scope global eth0 inet6 fe80::5054:ff:fe17:4b17/64 scope link valid_lft forever preferred_lft forever No virtualization involved. Prevented the IPv6 module from loading, same results (postfix-wise, of course the inet6 lines in the above output don't show up). Can anyone help me debug this further? Thanks Stefan