Mailing List Archive

On Wednesday 27 January 2010 03:49:05 pm 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?

You must update the existing record. There can only be one SPF record for a
domain.

Also email.c-span.org does not have an MX record (it is the MX for c-span.org
so mx:email.c-span.org will never match anything). Since email.c-span.org is
38.100.31.161, it's redundant anyway. mx expands to mx:email.c-span.org
(which is also the same IP). You almost certainly don't want PTR in your
record either (it's almost never useful, but unfortunately is included in the
output of most record wizards).

I think what you want is:

"v=spf1 ip4:38.100.31.161 ip4:38.100.31.150 -all"

Scott K


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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@c-span.org.c-span.org

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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