Package: postgrey Version: 1.36-5.1 Followup-For: Bug #821271 It still happens on buster. Found when I disabled IPv6:
net.ipv6.conf.all.disable_ipv6 = 1 Postgrey started to silently fail: root@myhost:/var/log# systemctl status postgrey ● postgrey.service - LSB: Start/stop the postgrey daemon Loaded: loaded (/etc/init.d/postgrey; generated) Active: active (exited) since Fri 2020-07-17 11:36:14 CEST; 2min 54s ago Docs: man:systemd-sysv-generator(8) Process: 6570 ExecStart=/etc/init.d/postgrey start (code=exited, status=0/SUCCESS) jul 17 11:36:14 myhost postgrey[6570]: whitelisted: 213.143.66.210/32 jul 17 11:36:14 myhost postgrey[6570]: Pid_file "/var/run/postgrey.pid" already exists. Overwriting! jul 17 11:36:14 myhost postgrey[6577]: Process Backgrounded jul 17 11:36:14 myhost postgrey[6577]: 2020/07/17-11:36:14 postgrey (type Net::Server::Multiplex) starting! pid(6577) jul 17 11:36:14 myhost postgrey[6570]: . jul 17 11:36:14 myhost systemd[1]: Started LSB: Start/stop the postgrey daemon. jul 17 11:36:14 myhost postgrey[6577]: Resolved [localhost]:10023 to [127.0.0.1]:10023, IPv4 jul 17 11:36:14 myhost postgrey[6577]: Resolved [localhost]:10023 to [::1]:10023, IPv6 jul 17 11:36:14 myhost postgrey[6577]: Binding to TCP port 10023 on host 127.0.0.1 with IPv4 jul 17 11:36:14 myhost postgrey[6577]: Binding to TCP port 10023 on host ::1 with IPv6 root@myhost:/var/log# root@myhost:/var/log# ps auxw|grep postg|grep -v grep root@myhost:/var/log# systemd should be aware about process dying! -- System Information: Debian Release: 10.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.19.0-9-amd64 (SMP w/2 CPU cores) Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8), LANGUAGE=es_ES.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/bash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages postgrey depends on: ii adduser 3.118 ii debconf [debconf-2.0] 1.5.71 ii libberkeleydb-perl 0.55-2 ii libnet-dns-perl 1.19-1 ii libnet-server-perl 2.009-1 ii libnetaddr-ip-perl 4.079+dfsg-1+b3 ii perl 5.28.1-6 ii ucf 3.0038+nmu1 Versions of packages postgrey recommends: ii libnet-rblclient-perl 0.5-3 ii libparse-syslog-perl 1.10-3 ii postfix 3.4.10-0+deb10u1 postgrey suggests no packages. -- debconf information: postgrey/1.32-3_changeport: