Servidores de correo evitar SPAM

Verificar si todo esta en orden
   http://www.mail-tester.com/web-vUjIFq
configurar postfix + opendkim
  https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy
En el tutorial explica mal la parte de DNS
  1.- Crear registro A -> mail
  2.- Crear Mx 0       -> mail.example.com
  3.- Crear TXT @      -> "v=spf1 mx ip4:...."
  4.- Crear TXT mail._domainkey ->"v=DKIM1; g=*; k=rsa; ...."
  
ssl y spam
https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-with-a-free-signed-ssl-certificate-on-a-vps
  
BackUps correos
editar nano /etc/postfix/main.cf agregar al final
___________________
#mails backups
sender_bcc_maps    = hash:/etc/postfix/archive_domain
recipient_bcc_maps = hash:/etc/postfix/archive_domain
____________
nano /etc/postfix/archive_domain
[email protected] [email protected]
___________
Crear la .db de archive_domain
postmap /etc/postfix/archive_domain
service postfix reload
########################
main.cf
sender_bcc_maps = regexp:/etc/postfix/archive_domain
recipient_bcc_maps = regexp:/etc/postfix/archive_domain
________________________________
/etc/postfix/archive_domain:
/^([^@]+)\@example\.com$/    [email protected]

http://serverfault.com/questions/407302/how-can-i-configure-postfix-to-retain-copies-of-all-email-sent-through-it
  
  
  HTTPS 
  
  http://docs.sentora.org/?node=102
  
  ---->JAIL USER SSH
        http://www.cyberciti.biz/faq/debian-ubuntu-restricting-ssh-user-session-to-a-directory-chrooted-jail/
  ---->Bloquear IPS
        https://elbauldelprogramador.com/20-ejemplos-de-iptables-para-sysadmins/#bloqueando-una-direcin-ip-block-ip
  
  -------------COnfiguracion segura en mail ----------------------
  
root@panel:~# cat /etc/postfix/main.cf

# postfix config file

# uncomment for debugging if needed
soft_bounce=yes

# postfix main
mail_owner = postfix
setgid_group = postdrop
delay_warning_time = 4

# postfix paths
html_directory = no
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix
queue_directory = /var/spool/postfix
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.2.2/samples
readme_directory = /usr/share/doc/postfix-2.2.2/README_FILES

# network settings
inet_interfaces = all
mydomain = panel.qkiez.com
myhostname = panel.qkiez.com
mynetworks = 127.0.0.1, 45.55.210.55
mydestination = localhost.$mydomain, localhost
relay_domains = proxy:mysql:/etc/sentora/configs/postfix/mysql-relay_domains_maps.cf

# mail delivery
recipient_delimiter = +

# mappings
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
#transport_maps = hash:/etc/postfix/transport
#local_recipient_maps =

# virtual setup
virtual_alias_maps = proxy:mysql:/etc/sentora/configs/postfix/mysql-virtual_alias_maps.cf,
                     regexp:/etc/sentora/configs/postfix/virtual_regexp
virtual_mailbox_base = /var/sentora/vmail
virtual_mailbox_domains = proxy:mysql:/etc/sentora/configs/postfix/mysql-virtual_domains_maps.cf
virtual_mailbox_maps = proxy:mysql:/etc/sentora/configs/postfix/mysql-virtual_mailbox_maps.cf
virtual_minimum_uid = 999
virtual_uid_maps = static:999
virtual_gid_maps = static:8
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1

# debugging
debug_peer_level = 2
debugger_command =
         PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
         xxgdb $daemon_directory/$process_name $process_id & sleep 5

# authentication
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth

# tls config
smtp_use_tls = yes
smtpd_use_tls = yes
##
smtpd_tls_security_level = may
smtp_tls_note_starttls_offer = yes
smtpd_tls_loglevel = 3
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
smtp_tls_session_cache_database = btree:$data_directory/smtp_tls_session_cache
##
#smtp_tls_session_cache_database = btree:$data_directory/smtp_tls_session_cache
smtpd_tls_key_file  = /etc/letsencrypt/live/panel.qkiez.com/privkey.pem
smtpd_tls_cert_file = /etc/letsencrypt/live/panel.qkiez.com/cert.pem
smtpd_tls_CAfile    = /etc/letsencrypt/live/panel.qkiez.com/chain.pem

# rules restrictions
smtpd_client_restrictions =
smtpd_helo_restrictions =
smtpd_sender_restrictions =
smtpd_recipient_restrictions = permit_sasl_authenticated,
        permit_mynetworks,
        reject_unauth_destination,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        reject_unknown_recipient_domain
# uncomment for realtime black list checks. (Warn: will also reject false positive)
#       ,reject_rbl_client zen.spamhaus.org
#       ,reject_rbl_client bl.spamcop.net
#       ,reject_rbl_client dnsbl.sorbs.net

smtpd_helo_required = yes
unknown_local_recipient_reject_code = 550
disable_vrfy_command = yes
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_banner = $myhostname ESMTP

#SMTP
smtp_tls_security_level = may
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_loglevel = 3
smtp_tls_CAfile = /etc/letsencrypt/live/panel.qkiez.com/chain.pem


message_size_limit = 20480000

milter_protocol = 2
milter_default_action = accept

smtpd_milters = inet:localhost:12301
non_smtpd_milters = inet:localhost:12301
--------------------------------------------------------------
root@panel:~# cat /etc/dovecot/conf.d/10-ssl.conf 
##
## SSL settings
##

# SSL/TLS support: yes, no, required. <doc/wiki/SSL.txt>
ssl = yes

# PEM encoded X.509 SSL/TLS certificate and private key. They're opened before
# dropping root privileges, so keep the key file unreadable by anyone but
# root. Included doc/mkcert.sh can be used to easily generate self-signed
# certificate, just make sure to update the domains in dovecot-openssl.cnf
ssl_cert = </etc/letsencrypt/live/panel.qkiez.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/panel.qkiez.com/privkey.pem

# If key file is password protected, give the password here. Alternatively
# give it when starting dovecot with -p parameter. Since this file is often
# world-readable, you may want to place this setting instead to a different
# root owned 0600 file by using ssl_key_password = <path.
#ssl_key_password =

# PEM encoded trusted certificate authority. Set this only if you intend to use
# ssl_verify_client_cert=yes. The file should contain the CA certificate(s)
# followed by the matching CRL(s). (e.g. ssl_ca = </etc/ssl/certs/ca.pem)
#ssl_ca = 

# Require that CRL check succeeds for client certificates.
#ssl_require_crl = yes

# Directory and/or file for trusted SSL CA certificates. These are used only
# when Dovecot needs to act as an SSL client (e.g. imapc backend). The
# directory is usually /etc/ssl/certs in Debian-based systems and the file is
# /etc/pki/tls/cert.pem in RedHat-based systems.
#ssl_client_ca_dir =
#ssl_client_ca_file =

# Request client to send a certificate. If you also want to require it, set
# auth_ssl_require_client_cert=yes in auth section.
#ssl_verify_client_cert = no

# Which field from certificate to use for username. commonName and
# x500UniqueIdentifier are the usual choices. You'll also need to set
# auth_ssl_username_from_cert=yes.
#ssl_cert_username_field = commonName

# DH parameters length to use.
#ssl_dh_parameters_length = 1024

# SSL protocols to use
#ssl_protocols = !SSLv2

# SSL ciphers to use
#ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL

# Prefer the server's order of ciphers over client's.
#ssl_prefer_server_ciphers = no

# SSL crypto device to use, for valid values run "openssl engine"
#ssl_crypto_device =
root@panel:~# 
---------------------------------------------------------
root@panel:~# cat /etc/dovecot/dovecot.conf
##
## Dovecot config file
##
listen = *
disable_plaintext_auth = no
ssl = yes

ssl_key  = </etc/letsencrypt/live/panel.qkiez.com/privkey.pem
ssl_cert = </etc/letsencrypt/live/panel.qkiez.com/cert.pem
#ssl_ca   = /etc/letsencrypt/live/panel.qkiez.com/chain.pem

log_timestamp = %Y-%m-%d %H:%M:%S 
#log_timestamp was present only in Ubuntu file
protocols = imap pop3 lmtp sieve
auth_mechanisms = plain login
passdb {
  driver = sql
  args = /etc/sentora/configs/dovecot2/dovecot-mysql.conf
}
userdb {
  driver = prefetch
}
userdb {
  driver = sql
  args = /etc/sentora/configs/dovecot2/dovecot-mysql.conf
}
mail_location = maildir:/var/sentora/vmail/%d/%n
first_valid_uid = 999
last_valid_uid = 999

first_valid_gid = 8
last_valid_gid = 8
#mail_plugins =
mailbox_idle_check_interval = 30 secs
maildir_copy_with_hardlinks = yes
service imap-login {
  inet_listener imap {
    port = 143
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
}
service lmtp {
  unix_listener lmtp {
    #mode = 0666
  }
}
service imap {
  vsz_limit = 256M
}
service pop3 {
}
service auth {
  unix_listener auth-userdb {
    mode = 0666
    user = vmail
    group = mail
  }

  # Postfix smtp-auth
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
  }
}

service auth-worker {
}
service dict {
  unix_listener dict {
    mode = 0666
    user = vmail
    group = mail
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  service_count = 1
  process_min_avail = 0
  vsz_limit = 64M
}
service managesieve {
}
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
protocol lda {
  mail_plugins = quota sieve
  postmaster_address = [email protected]
}
protocol imap {
  mail_plugins = quota imap_quota trash
  imap_client_workarounds = delay-newmail
}
lmtp_save_to_detail_mailbox = yes

protocol lmtp {
  mail_plugins = quota sieve
}
protocol pop3 {
  mail_plugins = quota
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv 
#pop3_uidl_format was present only in ubuntu file
}
protocol sieve {
  managesieve_max_line_length = 65536
  managesieve_implementation_string = Dovecot Pigeonhole
  managesieve_max_compile_errors = 5
}
dict {
  quotadict = mysql:/etc/sentora/configs/dovecot2/dovecot-dict-quota.conf
}
plugin {
# quota = dict:User quota::proxy::quotadict
  quota = maildir:User quota
  acl = vfile:/etc/dovecot/acls
  trash = /etc/sentora/configs/dovecot2/dovecot-trash.conf
  sieve_global_path = /var/sentora/sieve/globalfilter.sieve
  sieve = ~/dovecot.sieve
  sieve_dir = ~/sieve
  sieve_global_dir = /var/sentora/sieve/
  #sieve_extensions = +notify +imapflags
  sieve_max_script_size = 1M
  #sieve_max_actions = 32
  #sieve_max_redirects = 4
}

log_path = /var/log/dovecot.log
info_log_path = /var/log/dovecot-info.log
debug_log_path = /var/log/dovecot-debug.log
mail_debug=yes