Hello, I'm running Ubuntu 16.04.2 with Postfix 2.5.3.
I've noticed weird errors in the tail -f /var/log/mail.log

sudo tail -f /var/log/mail.log
Apr 24 10:57:37 smtp-h1 postfix[9995]: Postfix is running with backwards-compatible default settings
Apr 24 10:57:37 smtp-h1 postfix[9995]: See http://www.postfix.org/COMPATIBILITY_README.html for details
Apr 24 10:57:37 smtp-h1 postfix[9995]: To disable backwards compatibility use "postconf compatibility_level=2" and "postfix reload"
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10054]: warning: group or other writable: /usr/lib/postfix/./libpostfix-tls.so.1
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10055]: warning: group or other writable: /usr/lib/postfix/./libpostfix-master.so.1
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10056]: warning: group or other writable: /usr/lib/postfix/./libpostfix-global.so.1
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10057]: warning: group or other writable: /usr/lib/postfix/./sbin/lmtp
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10058]: warning: group or other writable: /usr/lib/postfix/./libpostfix-util.so.1
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10059]: warning: group or other writable: /usr/lib/postfix/./libpostfix-dns.so.1
Apr 24 10:57:38 smtp-h1 postfix/postfix-script[10060]: warning: group or other writable: /usr/lib/postfix/sbin/./lmtp

Checking my permissions

ls -la /usr/lib/postfix
total 752
drwxr-xr-x 3 root root 4096 Apr 24 09:19 .
drwxr-xr-x 140 root root 4096 Apr 24 09:19 ..
lrwxrwxrwx 1 root root 23 Apr 13 2016 libpostfix-dns.so.1 -> libpostfix-dns.so.1.0.1
-rw-r--r-- 1 root root 26968 Apr 13 2016 libpostfix-dns.so.1.0.1
lrwxrwxrwx 1 root root 26 Apr 13 2016 libpostfix-global.so.1 -> libpostfix-global.so.1.0.1
-rw-r--r-- 1 root root 281152 Apr 13 2016 libpostfix-global.so.1.0.1
lrwxrwxrwx 1 root root 26 Apr 13 2016 libpostfix-master.so.1 -> libpostfix-master.so.1.0.1
-rw-r--r-- 1 root root 39472 Apr 13 2016 libpostfix-master.so.1.0.1
lrwxrwxrwx 1 root root 23 Apr 13 2016 libpostfix-tls.so.1 -> libpostfix-tls.so.1.0.1
-rw-r--r-- 1 root root 103344 Apr 13 2016 libpostfix-tls.so.1.0.1
lrwxrwxrwx 1 root root 24 Apr 13 2016 libpostfix-util.so.1 -> libpostfix-util.so.1.0.1
-rw-r--r-- 1 root root 264504 Apr 13 2016 libpostfix-util.so.1.0.1
-rwxr-xr-x 1 root root 13052 Apr 13 2016 postfix_groups.pl
-rw-r--r-- 1 root root 14504 Apr 13 2016 postfix-sqlite.so.1.0.1
drwxr-xr-x 2 root root 4096 Apr 24 09:19 sbin

@smtp-h1:~$ ls -la /usr/lib/postfix/sbin

total 1252
drwxr-xr-x 2 root root 4096 Apr 24 09:19 .
drwxr-xr-x 3 root root 4096 Apr 24 09:19 ..
-rwxr-xr-x 1 root root 18376 Apr 13 2016 anvil
-rwxr-xr-x 1 root root 47448 Apr 13 2016 bounce
-rwxr-xr-x 1 root root 121176 Apr 13 2016 cleanup
-rwxr-xr-x 1 root root 10104 Apr 13 2016 discard
-rwxr-xr-x 1 root root 10184 Apr 13 2016 dnsblog
-rwxr-xr-x 1 root root 10104 Apr 13 2016 error
-rwxr-xr-x 1 root root 18376 Apr 13 2016 flush
-rwxr-xr-x 1 root root 10104 Apr 13 2016 fsstone
lrwxrwxrwx 1 root root 4 Apr 13 2016 lmtp -> smtp
-rwxr-xr-x 1 root root 59352 Apr 13 2016 local
-rwxr-xr-x 1 root root 38864 Apr 13 2016 master
-rwxr-xr-x 1 root root 59336 Apr 13 2016 oqmgr
-rwxr-xr-x 1 root root 14280 Apr 13 2016 pickup
-rwxr-xr-x 1 root root 22792 Apr 13 2016 pipe
-rwxr-xr-x 1 root root 9344 Apr 13 2016 postfix-script
-rwxr-xr-x 1 root root 32676 Apr 13 2016 postfix-tls-script
-rwxr-xr-x 1 root root 6543 Apr 13 2016 postfix-wrapper
-rwxr-xr-x 1 root root 29446 Apr 13 2016 post-install
-rwxr-xr-x 1 root root 9288 Apr 13 2016 postmulti-script
-rwxr-xr-x 1 root root 67528 Apr 13 2016 postscreen
-rwxr-xr-x 1 root root 18376 Apr 13 2016 proxymap
-rwxr-xr-x 1 root root 67528 Apr 13 2016 qmgr
-rwxr-xr-x 1 root root 22472 Apr 13 2016 qmqpd
-rwxr-xr-x 1 root root 14280 Apr 13 2016 scache
-rwxr-xr-x 1 root root 14392 Apr 13 2016 showq
-rwxr-xr-x 1 root root 125376 Apr 13 2016 smtp
-rwxr-xr-x 1 root root 232920 Apr 13 2016 smtpd
-rwxr-xr-x 1 root root 10184 Apr 13 2016 spawn
-rwxr-xr-x 1 root root 22712 Apr 13 2016 tlsmgr
-rwxr-xr-x 1 root root 22472 Apr 13 2016 tlsproxy
-rwxr-xr-x 1 root root 26968 Apr 13 2016 trivial-rewrite
-rwxr-xr-x 1 root root 14280 Apr 13 2016 verify
-rwxr-xr-x 1 root root 22472 Apr 13 2016 virtual

I was wondering how to get rid of these errors if possible and should i worry?
Thanks