I setup my mail server based on postfix on cento7 server. when I use online checking tools everything works fine with no errors.Local mail send test runs ok too, but I still can not receive/send mail unless I edit add 0.0.0.0/0 to mynetwork line lie this: mynetworks = , 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 X.X.X.X/29 0.0.0.0/0 X.X.X.X/29 this is the subnet of my server I know I should not do that but I can not find my way out. please help! here is my main.cf:

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 (CentOS) 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/letsencrypt/live/myserver.com/fullchain.pem smtpd_tls_key_file=/etc/letsencrypt/live/myserver.com/privkey.pem smtpd_use_tls=yes smtpd_tls_auth_only = yes smtp_tls_security_level = may smtpd_tls_security_level = may smtpd_sasl_security_options = noanonymous, noplaintext smtpd_sasl_tls_security_options = noanonymous

See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for

information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sender_restrictions = reject_unknown_sender_domain myhostname = myserver.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydomain = myserver.com myorigin = $mydomain mydestination = $mydomain, localhost, mail, mail.$mydomain relayhost = mynetworks = , 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 X.X.X.X/29 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all

Handing off local delivery to Dovecot’s LMTP, and telling it where to store mail

virtual_transport = lmtp:unix:private/dovecot-lmtp

Virtual domains, users, and aliases

virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf, mysql:/etc/postfix/mysql-virtual-email2email.cf