The output is indeed a non-root user, but before I run the command you mentioned, I modified the /etc/main.cf file, so now alias_maps = hash:/etc/aliases (without nis:mail.aliases) and it started working, it delivers the emails fine now. Thank you very much for your patience and help!
This issue is sorted now. -- View this message in context: http://postfix.1071664.n5.nabble.com/postfix-delivers-all-mail-to-root-s-mailbox-tp66059p66568.html Sent from the Postfix Users mailing list archive at Nabble.com.