On 2026-03-31 at 07:11:33 UTC-0400 (Tue, 31 Mar 2026 13:11:33 +0200)
Patrick Ben Koetter via mailop <[email protected]>
is rumored to have said:
# NOTE and Off-Topic: a:eu.kictanet.or.ke and mx:eu.kictanet.or.ke
repeat your
# final ip4:62.169.28.150 statement. Unless you really need them for
other
# purposes I'd get rid of a:eu.kictanet.or.ke and mx:eu.kictanet.or.ke
and
# leave only ip4:62.169.28.150. Having the DNS names in there causes
extra DNS
# lookups.
On the other hand, things do change and people do forget updating a TXT
record...
Specifying a, mx, and ip directives which happen to be redundant *today*
does impose (tiny) DNS cost on systems using SPF. As in so many things
with DNS, this is mitigated by having reasonably long DNS TTLs. If a
mail system changes it's IP or adds IPv6 outbound (imagine an optimistic
masochist...) and the SPF record has only a single ip4 directive, SPF
breaks. The a and mx directives can salvage that situation.
--
Bill Cole
[email protected] or [email protected]
(AKA @[email protected] and many *@billmail.scconsult.com
addresses)
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