Postfix Errors on new 26 install

@itsupport

Hi,

I noticed this too. From my initial understanding, these logs come from the stats service (carbonio-stats), not from mail delivery. On 26.6.0, carbonio-stats blocks something postqueue needs to read the network interfaces, so it keeps failing and retrying. 

Could you please try this:

• Create /etc/systemd/system/carbonio-stats.service.d/10-netlink.conf with:

  [Service]
  RestrictAddressFamilies=
  RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX AF_NETLINK
  SupplementaryGroups=postdrop

• systemctl daemon-reload
• systemctl restart carbonio-stats.service

Meanwhile, I will try to dig deeper and discuss this issue with the devs.

Thanks!

I can confirm that this issue is still present on a fresh Carbonio CE installation on Ubuntu 24.04.

The error is repeatedly generated by zmstat-mtaqueue running inside carbonio-stats.service:

postfix/postqueue: fatal: inet_addr_local[getifaddrs]: getifaddrs: Address family not supported by protocol

The MTA itself is working correctly, and running mailq manually as the zextras user works without any error:

$ su - zextras -c 'mailq'
Mail queue is empty

The problem is caused by the systemd sandbox configuration of carbonio-stats.service.

The packaged unit currently contains:

RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX

and does not provide the postdrop supplementary group.

We applied the following systemd override:

 removed link 

[Service]
RestrictAddressFamilies=
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX AF_NETLINK
SupplementaryGroups=postdrop

followed by:

systemctl daemon-reload
systemctl restart carbonio-stats.service

After the restart, the effective configuration is:

SupplementaryGroups=postdrop
RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX

and the recurring getifaddrs / postqueue fatal errors completely disappear.

zmstat-mtaqueue continues to work normally:

zmstat mtaqueue.csv: timestamp, KBytes, requests
...
0, 0

So the workaround suggested above is confirmed to solve the problem.

We are currently migrating several independent Zimbra servers to Carbonio CE, all using Ubuntu 24.04, so this is likely to affect every new installation using the same packaged carbonio-stats.service.

Could you please include this fix upstream in the Carbonio package, so that administrators do not need to maintain a local systemd override?

In particular, the packaged carbonio-stats.service should probably include:

RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX AF_NETLINK
SupplementaryGroups=postdrop

Thank you.