Dear All, I would like to build a relay smtp server for a system, where this system would like to send out mails to its customers. I went through the access control documentation, and this is what I came up with (in terms of access control). The system has its own IP address range and that is added to mynetworks and also there is one SASL authenticated user should be able to send out mails. Theoretically the setup is working, but I am interested in your opinions.
# ACCESS CONTROL smtpd_helo_required = yes smtpd_client_restrictions = reject_unknown_reverse_client_hostname smtpd_helo_restrictions = reject_unknown_helo_hostname reject_invalid_helo_hostname reject_non_fqdn_helo_hostname reject_unknown_helo_hostname smtpd_sender_restrictions = reject_unknown_sender_domain reject_non_fqdn_sender smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination smtpd_recipient_restrictions = reject_non_fqdn_recipient reject_unknown_recipient_domain permit_mynetworks permit_sasl_authenticated reject_unauth_destination Could you please take a look and suggest me what is wrong and what would you change? I am using Debian 12 with Postfix 3.7.4-2. I am still planning to add a strict SPF record and also DKIM. Thank you, Mitya
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