RDN elements of a single type may be selected by
a modifier of the type label; if so the expansion
result is a list (newline-separated by default).
RDN elements of a single type may be selected by
a modifier of the type label; if so the expansion
result is a list (newline-separated by default).
If an attempt to populate &$sender_host_name$& has been made
(by reference, &%hosts_lookup%& or
otherwise) then this boolean will have been set true if, and only if, the
If an attempt to populate &$sender_host_name$& has been made
(by reference, &%hosts_lookup%& or
otherwise) then this boolean will have been set true if, and only if, the
other times, this variable is false.
It is likely that you will need to coerce DNSSEC support on in the resolver
other times, this variable is false.
It is likely that you will need to coerce DNSSEC support on in the resolver
Exim does not perform DNSSEC validation itself, instead leaving that to a
validating resolver (eg, unbound, or bind with suitable configuration).
Exim does not perform DNSSEC validation itself, instead leaving that to a
validating resolver (eg, unbound, or bind with suitable configuration).
If you have changed &%host_lookup_order%& so that &`bydns`& is not the first
mechanism in the list, then this variable will be false.
If you have changed &%host_lookup_order%& so that &`bydns`& is not the first
mechanism in the list, then this variable will be false.
.cindex "DNS" "DNSSEC"
DNS lookups for domains matching &%dnssec_request_domains%& will be done with
the dnssec request bit set. Any returns not having the Authenticated Data bit
.cindex "DNS" "DNSSEC"
DNS lookups for domains matching &%dnssec_request_domains%& will be done with
the dnssec request bit set. Any returns not having the Authenticated Data bit
This applies to all of the SRV, MX, AAAA, A lookup sequence.
This applies to all of the SRV, MX, AAAA, A lookup sequence.