Mailing List Archive: SPF: Help

Trying to understand SPF for HELO/EHLO

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bobt at daviscomms

Apr 15, 2008, 10:28 AM

Post #1 of 4 (554 views)
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Trying to understand SPF for HELO/EHLO

I haven't been using SPF for HELO/EHLO, but would like to. To me it looks like it has a double entendre

Let's say I am sending messages from mydomain.com and I have setup proper SPF records identifying my outbound server as mail.myserver.com.

I add the record below for helo/ehlo
mail.myserver.com. 14400 IN TXT "v=spf1 ip4:serv.ers.ip.address -all"

Doesn't the txt spf record above also say it is OK for mail to come from user[at]mail.myserver.com as long as it comes from the 'ipi4:serv.ers.ip.address".

Thanks

Bob Davis

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michael at breton

Apr 15, 2008, 11:32 AM

Post #2 of 4 (509 views)
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Re: Trying to understand SPF for HELO/EHLO [In reply to]

Bob Davis wrote:
> I haven't been using SPF for HELO/EHLO, but would like to. To me it looks like it has a double entendre
>
> Let's say I am sending messages from mydomain.com and I have setup proper SPF records identifying my outbound server as mail.myserver.com.
>
> I add the record below for helo/ehlo
> mail.myserver.com. 14400 IN TXT "v=spf1 ip4:serv.ers.ip.address -all"
>
> Doesn't the txt spf record above also say it is OK for mail to come from user[at]mail.myserver.com as long as it comes from the 'ipi4:serv.ers.ip.address".
>
> Thanks
>
> Bob Davis
>
Hello Bob,

You are correct. That SPF record for mail.myserver.com does say that.

Generally, that is not a problem, provided you have constructed your SPF
record correctly.

You should use "example.com" instead of "myserver.com", the real owner
of that domain (In Tokyo), would probably appreciate it.

Michael Breton

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scott at kitterman

Apr 15, 2008, 11:39 AM

Post #3 of 4 (509 views)
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Re: Trying to understand SPF for HELO/EHLO [In reply to]

On Tue, 15 Apr 2008 10:28:25 -0700 "Bob Davis" <bobt[at]daviscomms.com> wrote:
>I haven't been using SPF for HELO/EHLO, but would like to. To me it looks
like it has a double entendre
>
>Let's say I am sending messages from mydomain.com and I have setup proper
SPF records identifying my outbound server as mail.myserver.com.
>
>I add the record below for helo/ehlo
>mail.myserver.com. 14400 IN TXT "v=spf1 ip4:serv.ers.ip.address
-all"
>
>Doesn't the txt spf record above also say it is OK for mail to come from
user[at]mail.myserver.com as long as it comes from the
'ipi4:serv.ers.ip.address".

Yes. That's by design.

Scott K

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bobt at daviscomms

Apr 15, 2008, 12:17 PM

Post #4 of 4 (509 views)
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Re: Trying to understand SPF for HELO/EHLO [In reply to]

OK, now I get it and thanks for the heads up on example.com, I see that it
is reserved for documentation by IANA as per RFC 2606.

Bob Davis
----- Original Message -----
From: "Michael Breton" <michael[at]breton.us>
To: <spf-help[at]v2.listbox.com>
Sent: Tuesday, April 15, 2008 11:32 AM
Subject: Re: [spf-help] Trying to understand SPF for HELO/EHLO

> Bob Davis wrote:
>> I haven't been using SPF for HELO/EHLO, but would like to. To me it
>> looks like it has a double entendre
>>
>> Let's say I am sending messages from mydomain.com and I have setup proper
>> SPF records identifying my outbound server as mail.myserver.com.
>>
>> I add the record below for helo/ehlo
>> mail.myserver.com. 14400 IN TXT "v=spf1
>> ip4:serv.ers.ip.address -all"
>>
>> Doesn't the txt spf record above also say it is OK for mail to come from
>> user[at]mail.myserver.com as long as it comes from the
>> 'ipi4:serv.ers.ip.address".
>> Thanks
>>
>> Bob Davis
>>
> Hello Bob,
>
> You are correct. That SPF record for mail.myserver.com does say that.
>
> Generally, that is not a problem, provided you have constructed your SPF
> record correctly.
>
> You should use "example.com" instead of "myserver.com", the real owner of
> that domain (In Tokyo), would probably appreciate it.
>
> Michael Breton
>
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