Postfix anti-spam settings

Next, I will use postfix to add anti-spam methods to prevent sender spoofing configurations. I hope this article will be helpful to you.

Added the following configurations to prevent sender spoofing:

The Code is as follows:

Copy code

# Smtpd related config Smtpd_recipient_restrictions = Permit_mynetworks, Permit_sasl_authenticated, # Reject_non_fqdn_hostname, Reject_non_fqdn_sender, Reject_non_fqdn_recipient, Reject_unauth_destination, Reject_unauth_pipelining, Reject_invalid_hostname   Smtpd_sender_restrictions = Permit_mynetworks, Check_recipient_access hash:/etc/postfix/local_recipient, Permit_sasl_authenticated, Reject_sender_login_mismatch, Reject_authenticated_sender_login_mismatch, Reject_unauthenticated_sender_login_mismatch, Reject_unknown_sender_domain # Smtp auth config here Broken_sasl_auth_clients = yes Smtpd_sasl_auth_enable = yes Smtpd_sasl_security_options = noanonymous

 

Supplement:

Configuring extmail does not allow spoofing of non-existent local email addresses to send emails, and does not allow sending emails with counterfeit others' email addresses.

Cd/etc/postfix/

Cat> mysql_virtual_sender_maps.cf <EOF
User = extmail
Password = extmail
Hosts = localhost
Dbname = extmail
Table = mailbox
Select_field = username
Where_field = username
Additional_conditions = AND active = '1'
EOF

Vim main. cf
Smtpd_sender_login_maps =
Mysql:/etc/postfix/mysql_virtual_sender_maps.cf

Smtpd_sender_restrictions =
Permit_mynetworks,
Reject_sender_login_mismatch,
Reject_authenticated_sender_login_mismatch,
Reject_unauthenticated_sender_login_mismatch

Make the configuration take effect

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