--- /usr/sbin/spampd	2021-08-02 09:49:07.000000000 +0200
+++ ./spampd	2021-08-02 17:22:00.596200965 +0200
@@ -557,7 +557,7 @@
   # https://github.com/apache/spamassassin/blob/3.4/lib/Mail/SpamAssassin/PerMsgStatus.pm#L1597
   ($spd_p->{sa_version} >= 3.0040) and eval {
     my $status = Mail::SpamAssassin::PerMsgStatus->new($sa_p);
-    $spd_p->{sa_rules_ver} = $status->get_tag("RULESVERSION");
+    $spd_p->{sa_rules_ver} = $status->get_tag("RULESVERSION") ? $status->get_tag("RULESVERSION") : "<unknown>";
   };
 
   $self->inf(ref($self)." v".$self->runtime_version()." ". ($self->is_reloading() ? "reloading": "starting") ." with: @startup_args \n");
@@ -1012,7 +1012,7 @@
     my $msg_score     = sprintf("%.2f", $status->get_hits);
     my $msg_threshold = sprintf("%.2f", $status->get_required_hits);
     my $proc_time     = sprintf("%.2f", time - $start);
-    my $rules_ver     = defined($prop->{sa_rules_ver}) ? ", rules v".$prop->{sa_rules_ver} : "";
+    my $rules_ver     = defined($prop->{sa_rules_ver}) ? ", rules ".$prop->{sa_rules_ver} : "";
 
     $self->inf("$was_it_spam $msgid ($msg_score/$msg_threshold) from $sender for " .
                     "$recips in " . $proc_time . "s, $size bytes$rules_ver.");
@@ -1467,7 +1467,7 @@
 
 sub runtime_version {
   my $self = $_[0];
-  my $rules_ver = defined($self->{spampd}->{sa_rules_ver}) ? ", rules v".$self->{spampd}->{sa_rules_ver} : "";
+  my $rules_ver = defined($self->{spampd}->{sa_rules_ver}) ? ", rules ".$self->{spampd}->{sa_rules_ver} : "";
   return $VERSION . ' [Perl '.(split(/v/, $^V))[-1] . ', ' .
     $self->net_server_type() . ' ' . Net::Server->VERSION() .
     ', SA ' . Mail::SpamAssassin::Version() . $rules_ver . ']';