Postfix XXXX в заголовке некоторых сообщений

[DIMMon]

Здравствуйте! Подскажите, пожалуйста отключить как убрать кресты русских символов в некоторых письмах?

Код: [Выделить]

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/postfix/mailname
mydestination =
relayhost = mail-srv
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.0.0/21 192.168.8.0/24 192.168.10.0/24 192.168.11.0/24 192.168.14.0/24 192.168.16.0/24 192.168.17.0/24 192.168.18.0/24 192.168.19.0/24 192.168.21.0/24 192.168.22.0/24 192.168.23.0/24 192.168.100.0/24 192.168.101.0/24 192.168.250.0/24 10.8.0.1
mailbox_size_limit = 0
recipient_delimiter = +
message_size_limit = 15728640
smtpd_sasl_local_domain =
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination
smtpd_sasl_authenticated_header = yes
smtpd_sasl_application_name = smtpd
mailbox_transport = lmtp:unix:/var/run/cyrus/socket/lmtp
local_recipient_maps =
virtual_alias_maps = hash:/etc/postfix/virtual_alias_maps
transport_maps = hash:/etc/postfix/transport_maps

# Запретить ETRN команду
smtpd_etrn_restrictions = reject

# Запретить VRFY команду
disable_vrfy_command = yes

# Требовать наличие EHLO (HELO) команды
smtpd_helo_required = yes

# Пропускать сообщения с NUL символами
message_strip_characters = \0


[fli]

чем письма смотришь?

[DIMMon]

roundcube или thunderbird. Но дело точно не в клиенте.