[pmg-devel] [PATCH pmg-api] reinject_email: fix connecting for ipv6-only hosts

[Stoiko Ivanov <s.ivanov@proxmox.com>]

When configuring PMG only with ipv6 addresses, reinject_email after processing
fails to connect to the postfix/smtpd instance (with EINVAL).

Setting the host to '::FFFF:127.0.0.1' fixes the issue.

Tested with:
* an ipv6only host (no ipv4 configured)
* a host with ipv6 disabled via sysctl:
```
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1
```
* a host with dual-stack setup

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
---
reported via community forum:
https://forum.proxmox.com/threads/unable-to-connect-to-localhost-at-port-10025.78199/

 src/PMG/Utils.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PMG/Utils.pm b/src/PMG/Utils.pm
index d0654e1..c5cf7b8 100644
--- a/src/PMG/Utils.pm
+++ b/src/PMG/Utils.pm
@@ -211,7 +211,7 @@ sub reinject_mail {
     my $resmess;
 
     eval {
-	my $smtp = Net::SMTP->new('127.0.0.1', Port => 10025, Hello => $me) ||
+	my $smtp = Net::SMTP->new('::FFFF:127.0.0.1', Port => 10025, Hello => $me) ||
 	    die "unable to connect to localhost at port 10025";
 
 	if (defined($xforward)) {
-- 
2.20.1