Mar   1   14 : 41 : 41  **** postfix/smtpd[ 4242 ]: [ID  197553  mail.info] NOQUEUE: reject: RCPT from unknown[ 10 . 99 . 8 . 12 ]:  554   5 . 7 . 1  <user@****.ru>: Relay access denied; from=<testuser@****.com> to=<user@****.ru> proto=ESMTP helo=<[ 192 . 168 . 8 . 12 ]>

Mar   1   14 : 40 : 14  **** postfix/smtpd[ 4158 ]: [ID  197553  mail.info] NOQUEUE: reject: RCPT from unknown[ 94 . 100 . 176 . 135 ]:  450   4 . 7 . 1  <fallback3.mail.ru>: Helo command rejected: Host not found; from=<m****e2003@list.ru>; to=<testuser@***.com> proto=SMTP helo=<fallback3.mail.ru>

queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
myhostname = mail.****.com
mydomain = ****.com
myorigin = $mydomain
mydestination = $myhostname, localhost.$mydomain, $mydomain
local_recipient_maps = unix:passwd.byname $alias_maps
unknown_local_recipient_reject_code =  550 
mynetworks =  10 . 10 . 0 . 0 / 16 ,  127 . 0 . 0 . 0 / 8 
relay_domains = $mydestination
alias_maps = dbm:/etc/postfix/aliases
mail_spool_directory = /mail/$user/
debug_peer_level =  2 
debugger_command =
         PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
         ddd $daemon_directory/$process_name $process_id & sleep  5 

sendmail_path = /usr/lib/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /etc/postfix
readme_directory = no

smtpd_sender_restrictions = dbm:/etc/postfix/access,reject_unknown_sender_domain
smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname,reject_unknown_hostname
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination 

smtpd_helo_required = yes

<m**** 3 @list.ru>: Host or domain name not found. Name service error for
    name=list.ru type=MX: Non-recoverable error