I am trying to troubleshoot after an update using apt-get update/upgrade I
did a few days ago on Debian 9 (now 10). PostFix does not seem to work
anymore. I tried many things: rebooting, restarting postfix, upgrading
debian from 9 to 10. But it is still not working as before.
I confirmed that the master.cf and main.cf were not changed by the
installer. Is there a troubleshooting guide somewhere?
Here is some info I got:
# service postfix status
? postfix.service - Postfix Mail Transport Agent
Loaded: loaded (/lib/systemd/system/postfix.service; disabled; vendor
preset: enabled)
Active: active (exited) since Fri 2020-10-09 05:26:54 PDT; 6min ago
Process: 3059 ExecStart=/bin/true (code=exited, status=0/SUCCESS)
Main PID: 3059 (code=exited, status=0/SUCCESS)
Oct 09 05:26:54 ...: Starting Postfix Mail Transport Agent...
Oct 09 05:26:54 ...: Started Postfix Mail Transport Agent.
# postfix -v check
postfix: name_mask: all
postfix: inet_addr_local: configured 5 IPv4 addresses
postfix: inet_addr_local: configured 2 IPv6 addresses
postfix: Postfix is running with backwards-compatible default settings
postfix: See http://www.postfix.org/COMPATIBILITY_README.html for details
postfix: To disable backwards compatibility use "postconf
compatibility_level=2" and "postfix reload"
postfix/postfix-script: warning: symlink leaves directory:
/etc/postfix/./makedefs.out
postfix/postfix-script: warning:
/var/spool/postfix/etc/ssl/certs/ca-certificates.crt and
/etc/ssl/certs/ca-certificates.crt differ
postfix/postfix-script: warning:
/var/spool/postfix/lib/i386-linux-gnu/libnss_systemd.so.2 and
/lib/i386-linux-gnu/libnss_systemd.so.2 differ
I looked at the log and saw similar warnings as above:
Oct 9 05:35:00 ...: name_mask: all
Oct 9 05:35:00 ...: inet_addr_local: configured 5 IPv4 addresses
Oct 9 05:35:00 ...: inet_addr_local: configured 2 IPv6 addresses
Oct 9 05:35:00 ...: Postfix is running with backwards-compatible
default settings
Oct 9 05:35:00 ...: See http://www.postfix.org/COMPATIBILITY_README.html
for details
Oct 9 05:35:00 ...: To disable backwards compatibility use "postconf
compatibility_level=2" and "postfix reload"
Oct 9 05:35:04 ...: warning: symlink leaves directory:
/etc/postfix/./makedefs.out
Oct 9 05:35:04 ...: warning:
/var/spool/postfix/etc/ssl/certs/ca-certificates.crt and
/etc/ssl/certs/ca-certificates.crt differ
Oct 9 05:35:05 ...: warning:
/var/spool/postfix/lib/i386-linux-gnu/libnss_systemd.so.2 and
/lib/i386-linux-gnu/libnss_systemd.so.2 differ
Oct 9 05:35:05 ...: postfix/postqueue[...]: warning: Mail system is
down -- accessing queue directly
I looked at the postfix compatibility web page but I am not sure what
options make it go into compatibility mode. Also the above are warnings so
I am guessing this would not prevent postfix from running. Or maybe
warnings are considered unacceptable?
I also tried this:
apt-get install --reinstall postfix
Do I really need to do these?
postconf compatibility_level=2
postfix reload
