On 18/11/2021 19:10, Bill Cole via Exim-users wrote:
Also welcome, short of a patch, would be clues about how to detect in an Exim-written Received header when a SMTP client IP has no rDNS or the rDNS name doesn't resolve to the client IP.
It would be more reliable to interpret an Authentication-Results header (cf. RFC 8601), assuming the Exim config creates one using the intended expansion item eg: add_header = :at_start:${authresults {$primary_hostname}} In either case you would be dependent on an rDNS check having done; this is not automatic and can be avoided by the config. Checks of the peer IP against a hostlist item which is a name will cause one, as will matching the host_lookup option or an explicit verify=reverse_host_lookup ACL condition. -- Cheers, Jeremy -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/