mail_location = maildir:/var/mail/vmail/%d/%u

Oct  7 21:28:16 localhost postfix/lmtp[30532]: B233A1F9A6: to=<adam@mail.com>, relay=mail.com[private/dovecot-lmtp], delay=0.05, delays=0.01/0.01/0/0.02, dsn=5.1.1, status=bounced (host mail.com[private/dovecot-lmtp] said: 550 5.1.1 <adam@mail.com> User doesn't exist: adam@mail.com (in reply to RCPT TO command))