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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