kibbelz@kibbelz-VirtualBox:/var/mail$ sudo cat /var/log/mail.log | grep -i error
Dec  5 12:22:35 kibbelz-VirtualBox postfix/error[15914]: D4D27320F4F: to=<-s@kibbelz-VirtualBox>, orig_to=<-s>, relay=none, delay=47, delays=47/0.05/0/0.06, dsn=5.1.3, status=bounced (bad address syntax)
Dec  5 12:22:35 kibbelz-VirtualBox postfix/error[15916]: D4D27320F4F: to=<wolfsrain69@gmail.com>, relay=none, delay=47, delays=47/0.1/0/0.02, dsn=5.0.0, status=bounced (gmail.com)
Dec  5 12:26:47 kibbelz-VirtualBox postfix/error[15977]: CDF41320F4F: to=<wolfsrain69@gmail.com>, relay=none, delay=4.5, delays=4.4/0.02/0/0.02, dsn=5.0.0, status=bounced (gmail.com)