Are these warnings in SMTP mail.log bad?

Jul 12 10:32:23 xserver postfix/smtpd[3892]: warning: 122.176.234.244: hostname abts-north-dynamic-244.234.176.122.airtelbroadband.in verification failed: nodename nor servname provided, or not known
Jul 12 10:34:07 xserver postfix/smtpd[3892]: warning: valid_hostname: empty hostname
Jul 12 10:34:26 xserver postfix/smtpd[3892]: warning: 14.99.180.20: hostname static-20.180.99.14.tataidc.co.in verification failed: nodename nor servname provided, or not known
Jul 12 10:37:32 xserver postfix/smtpd[4060]: warning: 189.61.198.209: hostname bd3dc6d1.virtua.com.br verification failed: nodename nor servname provided, or not known
Jul 12 10:37:46 xserver postfix/smtpd[4060]: warning: 67.23.255.158: hostname 67-23-255-158.static.dimenoc.com verification failed: nodename nor servname provided, or not known
curious because it's not clear whether these requests are being rejected (as they should be) or they're being accepted and our server is acting as a spam relay?!?

any tips/advice (especially regarding security/relay protection) would be greatly appreciated.
$ postconf -n
biff = no
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
enable_server_options = yes
header_checks = pcre:/etc/postfix/custom_header_checks
html_directory = /usr/share/doc/postfix/html
inet_interfaces = all
mail_owner = _postfix
mailbox_size_limit = 0
mailbox_transport = dovecot
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
maps_rbl_domains =
message_size_limit = 8388608
mydestination = $myhostname, localhost.$mydomain, localhost, mail.pretendco.com, pretendco.com, xserve.pretendco.com, $mydomain
mydomain = pretendco.com
mydomain_fallback = localhost
myhostname = xserve.pretendco.com
mynetworks = 127.0.0.0/8
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtp_sasl_auth_enable = no
smtp_sasl_password_maps =
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated reject_rbl_client zen.spamhaus.org permit
smtpd_enforce_tls = no
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_invalid_helo_hostname reject_non_fqdn_helo_hostname
smtpd_pw_server_security_options = cram-md5,gssapi
smtpd_recipient_restrictions = permit_sasl_authenticated permit_mynetworks  reject_unauth_destination check_policy_service unix:private/policy permit
smtpd_sasl_auth_enable = yes
smtpd_tls_CAfile =
smtpd_tls_cert_file =
smtpd_tls_exclude_ciphers = SSLv2, aNULL, ADH, eNULL
smtpd_tls_key_file =
smtpd_tls_loglevel = 0
smtpd_use_pw_server = yes
smtpd_use_tls = no
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_alias_maps = $virtual_maps

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