spfdiscuss at alandoherty
Jan 27, 2010, 3:59 PM
Post #3 of 3
(437 views)
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first up scott is 100% on the syntax
but secondly i'm guessing you actually wanted this spf record to be for
c-span.org
but you have quoted and published only an entry for
c-span.org.c-span.org
ie users with an email address of user [at] c-span
i suspect this was an error in your editing of the zone file by not placing it in the start {where origin is c-span.org}
but placing it lower and naming its origin as
c-span.org {which will have the zone auto-appended}
instead of
c-span.org. {the . is very important}
but yes as scott says as far as the text record
remember always ip4: records first {0 extra lookups no timeouts or slowdown possibilities}
then any a: records {1 extra lookup so potential for slowdown}
then any mx: records {2-infinite extra lookup so potential for slowdown}
then any include: records {1-infinite extra lookup so potential for slowdown}
and never use ptr its just pointless realy
as the 2 ip4: records cover all your ip's you should list them first, and not bother with the others as they will either slow down receivers getting to the -all when forgeries come in, or result in tempfail/permfail errors {instead of hardfail} if they are botched like the mx:email.c-span.org
At 20:49 27/01/2010 Wednesday, Martin, Sam wrote:
>All
>
> From nslookup;
>
>Non-authoritative answer:
>
>c-span.org.c-span.org text =
>
>
>
> "v=spf1 mx ptr ip4:38.100.31.161 mx:email.c-span.org -all"
>
>
>
>I want to add another authorized smtp server at 38.100.31.150. Do I
>need another TXT record or can I update the existing record?
>
>Syntax checkers don't like my attempts to do the latter, including;
>
>Non-authoritative answer:
>
> "v=spf1 mx ptr ip4:38.100.31.161,38.100.31.150
>mx:email.c-span.org -all"
>
>And
>
> "v=spf1 mx ptr ip4:38.100.31.161;38.100.31.150
>mx:email.c-span.org -all"
>
>
>
>Suggestions?
>
>All the best
>
>
>
>
>
>
>
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