There are some ips that when wanting to connect with my postfix it is impossible to do so when connecting in the same second they disconnect without sending any data
for example:

Sep 26 21:20:47 ns postfix / smtpd [4679]: connect from mail2.segurcaixaadeslas.es [195.77.158.25] Sep 26 21:20:47 ns postfix / smtpd [4679]: disconnect from mail2.segurcaixaadeslas.es [195.77.158.25]


This is my postconf -n configuration

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
allow_percent_hack = no
allow_untrusted_routing = yes
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
home_mailbox = Maildir/
ignore_mx_lookup_error = yes
inet_protocols = ipv4
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
mydestination = ns.almogavers.net, localhost.almogavers.net, almogavers.net , localhost
myhostname = ns.almogavers.net
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.2
mynetworks_style = class
myorigin = /etc/mailname
notify_classes = bounce, 2bounce, delay, policy, protocol, resource, software
readme_directory = no
recipient_delimiter = +
sender_bcc_maps = hash:/etc/postfix/bcc
sender_dependent_default_transport_maps = hash:/etc/postfix/dependent
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_client_restrictions = permit_mynetworks permit_inet_interfaces permit_tls_all_clientcerts reject_unknown_reverse_client_hostname permit_sasl_authenticated
smtpd_hard_error_limit = 20
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname, permit
smtpd_recipient_restrictions = permit_sasl_authenticated permit_mynetworks reject_unauth_destination reject_unauth_destination reject_invalid_hostname reject_non_fqdn_hostname reject_non_fqdn_sender reject_non_fqdn_recipient reject_unknown_sender_domain reject_unknown_recipient_domain permit_mynetworks reject_rbl_client sbl.spamhaus.org reject_rbl_client cbl.abuseat.org reject_rbl_client dul.dnsbl.sorbs.net permit_inet_interfaces reject_unknown_reverse_client_hostname check_policy_service inet:127.0.0.1:10023 smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination permit_inet_interfaces reject_unknown_reverse_client_hostname
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_tls_cert_file = /etc/postfix/postfix.cert.pem
smtpd_tls_key_file = /etc/postfix/postfix.key.pem
smtpd_tls_mandatory_ciphers = high
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_security_level = encrypt
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_maps = hash:/etc/postfix/virtual


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Description: Firma criptográfica S/MIME

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