Hello all, RFC 5321, in section 4.1.1.1, states that a valid argument to the EHLO command is either a ⟨Domain⟩ or an ⟨address-literal⟩.
Postfix allows the adminstrator to selectively control access to the SMTP server either by ⟨Domain⟩ via the check_helo_access , the check_helo_mx_access or check_helo_ns_access tables, or by the IP addresses resolved from that ⟨Domain⟩ via check_helo_a_access tables. Since ⟨address-literal⟩s are legal arguments for the EHLO command, which of the check_helo_access or check_helo_a_access tables are appropriate to control access to the SMTP server based on ⟨address-literal⟩s, as opposed to the IP addresses resolved from ⟨Domain⟩s? Thanks, Mono
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