Instalam Postfix (open source Mail Transfer Agent) si Cyrus (server de mail)

sudo yum install postfix

sudo yum install cyrus-sasl
sudo yum install cyrus-imapd

Configurare Postfix

Deschidem fisierul de configurare Postfix

sudo vi /etc/postfix/main.cf

Se copiaza urmatorul cod si se inlocuieste exemplu.ro din linia mydomain cu domeniu propriu:

soft_bounce = no
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix

# The default_privs parameter specifies the default rights used by
# the local delivery agent for delivery to external file or command.
# These rights are used in the absence of a recipient user context.
# DO NOT SPECIFY A PRIVILEGED USER OR THE POSTFIX OWNER.
#
#default_privs = nobody

myhostname = mail.exemplu.ro
mydomain = exemplu.ro

mydestination = $myhostname, localhost
unknown_local_recipient_reject_code = 550

mynetworks_style = host
mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp
local_destination_recipient_limit = 300
local_destination_concurrency_limit = 5
recipient_delimiter=+

virtual_alias_maps = hash:/etc/postfix/virtual

header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = pcre:/etc/postfix/body_checks
smtpd_banner = $myhostname

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

sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES

smtpd_sasl_auth_enable = yes
smtpd_sasl_application_name = smtpd
smtpd_recipient_restrictions = permit_sasl_authenticated,
permit_mynetworks,
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,
reject_unauth_pipelining,
reject_rbl_client zen.spamhaus.org,
reject_rbl_client bl.spamcop.net,
reject_rbl_client dnsbl.njabl.org,
reject_rbl_client dnsbl.sorbs.net,
permit

smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain =
broken_sasl_auth_clients = yes

smtpd_helo_required = yes

Finalizare configurare Postfix

In fisierul config am inclus aliasuri virtuale in linia “virtual_alias_maps = hash:/etc/postfix/virtual”
Acum trebuie setata baza de date

Deschidem fisierul respectiv:

sudo vi /etc/postfix/virtual

Stergem tot textul si adaugam urmatoarele linii, inlocuind “user” cu un utilizator existent si “domain” cu domeniu propriu.

user@exemplu.ro user@exemplu.ro
Salvam si iesim.
Apoi executam comanda:

postmap /etc/postfix/virtual
Aceasta va transforma fisierul virtual intr-o tablea de tip “lookup” creand baza de date necesara pentru ca postfix sa functioneze.

La final executam urmatoarea comanda care va crea noul fisier pe care postfix-ul il va folosi inainte sa trimita mailuri.

touch /etc/postfix/body_checks

Configurare Cyrus

Creem fisierul smtpd.conf, care defineste autentificarea pentru Postfix/SASL, in folderul SASL:

sudo vi /etc/sasl2/smtpd.conf
Se copiaza urmatorul text in fisier:

pwcheck_method: auxprop
auxprop_plugin: sasldb
mech_list: PLAIN LOGIN CRAM-MD5 DIGEST-MD5

Salvam si iesim.
Apoi configuram fisierul Cyrus:

sudo vi /etc/imapd.conf
Stergem tot ce este in fisier si copiem urmatorul text, inlocuind numele de domeniu si server cu cele proprii:

virtdomains: userid
defaultdomain: exemplu.ro
servername: exemplu.ro
configdirectory: /var/lib/imap
partition-default: /var/spool/imap
admins: cyrus
sievedir: /var/lib/imap/sieve
sendmail: /usr/sbin/sendmail.postfix
hashimapspool: true
allowanonymouslogin: no
allowplaintext: yes
sasl_pwcheck_method: auxprop
sasl_mech_list: CRAM-MD5 DIGEST-MD5 PLAIN
tls_cert_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem
tls_key_file: /etc/pki/cyrus-imapd/cyrus-imapd.pem
tls_ca_file: /etc/pki/tls/certs/ca-bundle.crt

autocreatequota: -1
createonpost: yes
autocreateinboxfolders: spam
autosubscribeinboxfolders: spam

Salvam si iesim.