[Dev][CI] Email reports are not being sent due to network issues sending emails

[raulcd]

Describe the bug, including details regarding any error messages, version, and platform.

The reports for CUDA Extra, CPP Extra, R Extra and Package Linux are failing to be sent due to network errors when connecting to the SMTP server:

   File "/opt/hostedtoolcache/Python/3.14.3/x64/lib/python3.14/smtplib.py", line 348, in connect
    self.sock = self._get_socket(host, port, self.timeout)
                ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.14.3/x64/lib/python3.14/smtplib.py", line 319, in _get_socket
    return socket.create_connection((host, port), timeout,
           ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
                                    self.source_address)
                                    ^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.14.3/x64/lib/python3.14/socket.py", line 870, in create_connection
    raise exceptions[0]
  File "/opt/hostedtoolcache/Python/3.14.3/x64/lib/python3.14/socket.py", line 855, in create_connection
    sock.connect(sa)
    ~~~~~~~~~~~~^^^^
OSError: [Errno 101] Network is unreachable

Example of job failure:
https://github.com/apache/arrow/actions/runs/22124872487/job/63956530199

Could it be that the commit-email.info is unreachable?

Component(s)

Continuous Integration, Developer Tools

[raulcd]

@kou do you know it there's any issue related to the commit-email.info SMTP server?

[kou]

Oh, sorry. I didn't notice it. I checked the host. The host is live but IPv4 and IPv6 addresses aren't set. So I re-set IPv4 and IPv6 addresses. It works again.