Hello, how i have to edit /etc/postfix/main.cf with my own domain i bought? for example this@ismydomain.fun
myhostname = this@ismydomain.fun
mydomain = ismydomain.fun
myorigin = $mydomain
inet_interfaces = localhost
inet_protocols = ipv4
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 127.0.0.0/8 myip/24
home_mailbox = Maildir/
I don't want use external services like Gmail, ecc ecc, But i don't know how to properly setup a mail service in my pc

you need to have a public ip to host your mail server
and your pc has to be online all the time or else you will lost emails
and with that said, make sure your system is secured

you will need a cert from a trusted CA or you can use letsencrypt

check out this link might give you some idea: https://www.redhat.com/sysadmin/inst...figure-postfix

Yes,i know, but i don't trust em. So, is the configuration i posted right?

it's quite hard to say, postfix configuration varies always depends on the usage or as desired by the admin.

you can try it, if it's working then I guess it is indeed correct. Give it a shot!

However, try to monitor always for any malicious activity.


just an example, it's your final call to implement:

Hi, thanks a lot for helpin. I did this:
compatibility_level = 3.8
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
unknown_local_recipient_reject_code = 550
debug_peer_level = 2

debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
ddd $daemon_directory/$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/samples
readme_directory = /usr/share/doc/postfix/README_FILES
meta_directory = /etc/postfix
shlib_directory = /usr/lib64/postfix
myhostname = mail.xxx.xx
mydomain = xxx.xx
myorigin = $mydomain
inet_protocols = ipv4
inet_interfaces = all
mynetworks = 127.0.0.0/8, xxxxxx/24
disable_vrfy_command = yes
message_size_limit = 10240000
smtpd_helo_required = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_mynetworks, permit_auth_destination, permit_sasl_authenticated, reject
smtpd_banner = $myhostname ESMTP
smtpd_tls_cert_file = /etc/ssl/certs/mailserver.crt
smtpd_tls_key_file = /etc/ssl/private/mailserver.key
smtpd_tls_security_level = may
smtp_tls_CApath = /etc/pki/tls/certs
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
maillog_file = /var/log/maillog
Then added rules to Firewall
firewall-cmd --add-service=smtp
firewall-cmd --runtime-to-permanent
firewall-cmd --add-service=smtp

Worked!
Now the question is: if i leave my pc on, the IP wont change, but what about if i turn off my pc?

Attached Thumbnails

 

assign a static IP