[Bug 255406] mail/emailrelay: only listening on IPv6 ports and won't accept IPv4 address parameters

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255406

            Bug ID: 255406
           Summary: mail/emailrelay: only listening on IPv6 ports and
                    won't accept IPv4 address parameters
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: andymac at bullseye.apana.org.au
                CC: robertn at the-nelsons.org
                CC: robertn at the-nelsons.org
             Flags: maintainer-feedback?(robertn at the-nelsons.org)

System: 12.2 RELEASE amd64 with 2 ethernet interfaces both with IPv4 addresses
but IPv6 disabled; loopback interface still has IPv4 and IPv6.  Port installed
as package (emailrelay-1.9_6).

Problem: any attempt to configure an interface with only an IPv4 address for
the --listen option results in:

(for IPv4 address)
emailrelay: error: invalid ip address string: invalid format: 192.168.10.2
emailrelay: exception: invalid ip address string: invalid format: 192.168.10.2

(for interface name)
emailrelay: error: invalid ip address string: invalid format: em0
emailrelay: exception: invalid ip address string: invalid format: em0

using "emailrelay --interface <address> --port 10025 --as-proxy localhost 25"

If the interface isn't specified so emailrelay should listen on all interfaces
for port 10025 (i.e. "emailrelay --port 10025 --as-proxy localhost:25"),
sockstat reports:
  daemon emailrelay <pid> 3 tcp6 *:10025 *:*

which suggests that emailrelay is only listening on IPv6 addresses as proto
would be tcp46 if listening on both -4 and -6 addresses.

PR 204126 seems to have been related but a long time ago.  I note from the port
commit log that the IPv6 configuration was changed relatively recently.  The
emailrelay documentation suggests that mixed IPv4 & IPv6 operation should be
supported.

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