dns - Records can not be found -


issue: spf record (txt) can not retrieved dns entry of domain zwischengas.com
in dns entry have 1 line spf record (as txt entry):

@  in txt "v=spf1 ip4:188.a.b.c ip4:xyz/22 ip4:xyz/24 ip4:xyz/21 ip4:xyz/24 ip4:xyz/24" "ip4:xyz ip4:xyz/22 ip4:xyz ip4:xyz/29 ip4:xyz/29 ip4:xyz/28" "ip4:xyz/24 ip4:xyz/24 mx ?all"

i have problem, spf record can not found , have no clue why. according rfc splitting long line multiple strings recommended in order keep substrings smaller 255 characters.

my domain zwischengas.com , mail server's ip 188.a.b.c, clue?

i tried these tests without success:

host -t txt zwischengas.com spfquery -ip-address 188.a.b.c -m test@zwischengas.com -h zwischengas.com

also tests online tools without success:

also google mail (gmail.com) can not retrieve spf record (according original mail header section):

received-spf: neutral (google.com: 188.a.b.c neither permitted nor denied best guess record domain of noreply1@zwischengas.com) client-ip=188.a.b.c;

working solution

you can test correctness of spf record calling 

host -t txt myhost.com

a simple spf record this: 

@ in txt "v=spf1 ip4:244.11.23.13 mx ?all"

if add ips 1 after other, can end in error messages dns server saying string long.
valid solution introduce " " it.

so instead of 

@  in txt "v=spf1 ip4:244.11.23.13 ip4:144.21.23.13 ip4:222.11.11.13 ip4:244.182.23.191 ip4:203.101.22.13 mx ?all"

you have (an example):

@ in txt "v=spf1 ip4:244.11.23.13 ip4:144.21.23.13" " ip4:222.11.11.13 ip4:244.182.23.191" " ip4:203.101.22.13 mx ?all"

the " " option described in appropriate rfc , accepted dns servers (what happens is, " " removed , substrings concatenated).

but if have 20 ips? end in string far longer allowed. can do?

the solution called: include

an example:

@ in txt "v=spf1 include:_spf1.myhost.com include:_spf2.myhost.com mx ?all" _spf1 in txt "v=spf1 ip4:244.11.23.13 ip4:144.21.23.13 mx ?all" _spf2 in txt "v=spf1 ip4:222.11.11.13 ip4:244.182.23.191 ip4:203.101.22.13 mx ?all"

you can extend n hierarchies. hope helps took me time find out!!


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