--- amavis-v2.13.0/lib/Amavis/Conf.pm.orig	2023-03-27 12:13:46.358912246 +0200
+++ amavis-v2.13.0/lib/Amavis/Conf.pm	2023-03-27 12:15:04.675519360 +0200
@@ -3,6 +3,7 @@
 package Amavis::Conf;
 use strict;
 use re 'taint';
+use Net::Domain;
 
 # constants;  intentionally leave value -1 unassigned for compatibility
 use constant D_TEMPFAIL => -4;
@@ -748,7 +749,8 @@
 
   # $myhostname is used by SMTP server module in the initial SMTP welcome line,
   # in inserted Received: lines, Message-ID in notifications, log entries, ...
-  $myhostname = (POSIX::uname)[1];  # should be a FQDN !
+  $ENV{'PATH'} = "";
+  $myhostname = Net::Domain::hostfqdn();  # should be a FQDN !
 
   $snmp_contact  = '';  # a value of sysContact OID
   $snmp_location = '';  # a value of sysLocation OID