$VAR1 = 'Nov 19 06:31:17 proxy postgrey[2439]: action=pass, reason=triplet found, client_name=r41.newsletter.otto.de, client_address=185.15.51.41, sender=otto@newsletter.otto.de, recipient=some.one@some.domain';
$VAR2 = 'Nov 19 06:37:45 proxy postgrey[2439]: action=pass, reason=triplet found, client_name=uspmta194080.emarsys.net, client_address=217.175.194.80, sender=suite17@xpressus.emarsys.net, recipient=other.one@some.domain';

##</code><code>##

for my $x ( @results ) {
    chomp $x;
    my ($date) = split /'[A-z]*.[0-9]*.[0-9]*:[0-9]*:[0-9]*/, $x;
    push @out, $date; 
}   

##</code><code>##

$VAR1 = 'Nov 19 06:31:17 proxy postgrey[2439]: action=pass, reason=triplet found, client_name=r41.newsletter.otto.de, client_address=185.15.51.41, sender=otto@newsletter.otto.de, recipient=some.one@some.domain';