cat /var/log/mail.log
May 15 00:20:03 lex postfix/smtpd[22321]: warning: 178.140.205.246: hostname broadband-178-140-205-246.nationalcablenetworks.ru verification failed: Name or service not known
May 15 00:20:03 lex postfix/smtpd[22321]: connect from unknown[178.140.205.246]
May 15 00:20:06 lex postfix/smtpd[22321]: warning: SASL authentication failure: Password verification failed
May 15 00:20:06 lex postfix/smtpd[22321]: warning: unknown[178.140.205.246]: SASL PLAIN authentication failed: authentication failure
May 15 00:20:08 lex postfix/smtpd[22321]: warning: unknown[178.140.205.246]: SASL LOGIN authentication failed: authentication failure
May 15 00:20:10 lex postfix/smtpd[22323]: connect from forward14.mail.yandex.net[95.108.130.92]
May 15 00:20:10 lex postfix/smtpd[22323]: NOQUEUE: reject: RCPT from forward14.mail.yandex.net[95.108.130.92]: 450 4.7.1 Session encryption is required; from=<kotischewsky@yandex.ru> to=<komdir@ins-c.ru> proto=ESMTP helo=<forward14.mail.yandex.net>
May 15 00:20:10 lex postfix/smtpd[22323]: disconnect from forward14.mail.yandex.net[95.108.130.92]

smtpd_banner = $myhostname Welcome to the Sendmail server
biff = no 
append_dot_mydomain = no
mydomain = ins-c.ru
myhostname = mailer.ins-c.ru
mydestination = localhost, localhost.$myhostname, $myhostname
home_mailbox = Maildir/ 
mailbox_command = procmail -a «$EXTENSION» 
virtual_mailbox_domains = /etc/postfix/vhosts 
virtual_mailbox_base = /home/vmail 
virtual_mailbox_maps = hash:/etc/postfix/vmaps 
virtual_minimum_uid = 1000 
virtual_uid_maps = static:5000 
virtual_gid_maps = static:5000 
alias_maps = hash:/etc/aliases 
alias_database = hash:/etc/aliases 
relay_domains = no
myorigin = $mydomain 
mynetworks = 127.0.0.0/8 95.84.240.34 178.140.205.246
mailbox_size_limit = 0 
message_size_limit = 20000000
recipient_delimiter = + 
inet_interfaces = all 

smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =
broken_sasl_auth_clients = yes

smtpd_recipient_restrictions = permit_mynetworks,
    permit_sasl_authenticated,
    reject_unauth_destination,
    reject_non_fqdn_recipient,
    reject_unverified_recipient,
    reject_unknown_client,
    reject_unverified_sender,

smtp      inet  n       -       -       -       -       smtpd -o content_filter=myfilter:dummy

pickup    fifo  n       -       -       60      1       pickup
cleanup   unix  n       -       -       -       0       cleanup
qmgr      fifo  n       -       n       300     1       qmgr
#qmgr     fifo  n       -       -       300     1       oqmgr
tlsmgr    unix  -       -       -       1000?   1       tlsmgr
rewrite   unix  -       -       -       -       -       trivial-rewrite
bounce    unix  -       -       -       -       0       bounce
defer     unix  -       -       -       -       0       bounce
trace     unix  -       -       -       -       0       bounce
verify    unix  -       -       -       -       1       verify
flush     unix  n       -       -       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       -       -       -       smtp
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay     unix  -       -       -       -       -       smtp
    -o smtp_fallback_relay=
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       -       -       -       showq
error     unix  -       -       -       -       -       error
retry     unix  -       -       -       -       -       error
discard   unix  -       -       -       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       -       -       -       lmtp
anvil     unix  -       -       -       -       1       anvil
scache    unix  -       -       -       -       1       scache

maildrop  unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}

uucp      unix  -       n       n       -       -       pipe
  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)

ifmail    unix  -       n       n       -       -       pipe
  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp     unix  -       n       n       -       -       pipe
  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix    -    n    n    -    2    pipe
  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman   unix  -       n       n       -       -       pipe
  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
  ${nexthop} ${user}
myfilter unix    -    n    n    -    -    pipe
  flags=R user=clamav argv=/usr/local/bin/myfilter.sh -f ${sender} -- ${recipient}

submission    inet    n    -    n    -    -    smtpd
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_client_restrictions=permit_sasl_authenticated,reject
    -o cleanup_servicename=sasl_cleanup

sasl_cleanup    unix    n    -    n    -    0    cleanup
    -o header_checks=regexp:/etc/postfix/sub_header