Meng Weng Wong wrote:
2) if the domain does NOT have an MX record,
but it does have an A record,
and if the domain does not have an SPF record,
then assume the default SPF record "v=spf1 a -all".
I have tested this rule for some time, and had to remove it again because it
filters legitimate mail.
For example there is mail from from 209.119.0.163 (=plantain.ease.lsoft.com)
with the envelope sender owner-dostravel(_at_)LISTS(_dot_)STATE(_dot_)GOV(_dot_)
LISTS.STATE.GOV has no SPF record and no MX record but an A record
(209.119.0.61) and you can send mail to
owner-dostravel(_at_)LISTS(_dot_)STATE(_dot_)GOV(_dot_)
But "v=spf1 a -all" incorrectly returns 'fail'.
Roger