On Tue January 13 2009 20:50:11 Rick Moen wrote:
| Briefly removing this conversation from the purely theoretical, just
| to
| be contrary:
| :r! dig -t txt linux.ie +short
| [returns null]
| :r! dig -t txt linuxmafia.com +short
| "v=spf1 a mx -all"
| Does ILUG have something against our being able validate its mailing
| lists' envelope headers?
Since you ask, the linux.ie domain isn't exclusively used for mailing
lists, and since the assorted users of the domain are scattered hither and
yon, it's not a given that they are in a position to use the linux.ie MXes
to send e-mail via them.
If you define SPF records for a domain then any mail server which uses SPF
as a criterion for pass/fail will reject mails that are sent through some
other SMTP server.
Finally in not all cases are the MXes listed the actual home server of the
domain, if you list that actual server in the SPF records you are
publishing that as a candidate for carpet bombing to try and bypass mail
filters; that's less of a risk if you identify a subnet rather than a host
as an additional valid source.
Paul
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