Re: SPF record question

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From: Kevin D. Goodknecht Sr. [MVP] (admin_at_nospam.WFTX.US)
Date: 09/17/04 

Date: Thu, 16 Sep 2004 21:05:24 -0500

In news:O3m9EtBnEHA.4004@TK2MSFTNGP10.phx.gbl,
Sharad Naik <sharadnaik@nospam-vsnl.net> wrote their comments
Then Kevin replied below:
> Please see in between the lines:
> "Kevin D. Goodknecht Sr. [MVP]" <admin@nospam.WFTX.US>
> wrote in message
> news:umrQZc$mEHA.340@tk2msftngp13.phx.gbl...
>> In news:eHyZIe7mEHA.744@TK2MSFTNGP10.phx.gbl,
>> Sharad Naik <sharadnaik@nospam-vsnl.net> wrote their
>> comments
>> Then Kevin replied below:
>>> Whatever I learnt in the past week about SPF, I am more
>>> inclined to say that it will hardly help in reducing
>>> spam
>>
>> You are probably correct, it does mean that spam _will_
>> have to come from a mail server that is valid to receive
>> mail for the mail domain if SPF is enforced by the
>> accepting SMTP server. It does not mean that the user
>> mail box is valid.
>> There is no one answer to reduce spam, it is going to
>> take a concerted effort by mail server administrators to
>> not only enforce SPF, they should shut down open relay
>> mail servers and verifying legitimate senders of bulk
>> email.
>> The biggest problem is that much of the bulk unsolicited
>> email originates from outside your national borders
>> where spammers are not restricted.
>
> True. And for sincere spammers SPF implemention will not
> bother much.
>
>>> and will make one miss solicited mails.
>>
>> Not really, I would expect anyone sending mail to me to
>> use a valid email address from a mail server authorized
>> to send mail for the email address.
>
> OK. Just as an example, next week I will be in
> switzerland and the hotel I booked
> confirm that I will have a wireless lan access to
> internet.
> I tried to get there range of IP addresses but in vain.
> (They could not understand
> my questions, and they simply don't know what is an IP
> address.)
> So from my laptop I can send mail using my smtp server
> but though I myself am responsible for managing my spf
> record, I simply don't know which subnet to add in the
> spf record for myself to enable to send mail.
>
> So isn't it like people whom I will try to send mail,
> will miss my mails, if they have
> adopted spf checking in their mail systems?
>
> Of course once I am there I will find out their subnet
> and incluce it in my spf when I am
> back. But what abt when next time I visit France,
> Germany, SA?
> Or even if I visit Swiss in the same hotel and they have
> changed their ISP?

So your saying that your laptop has an SMTP server?
If not then you are OK because you send mail to your mail server, which in
turn sends the email. Most SMTP servers will allow you to send mail from
anywhere as long as you can Authenticate to it. The IP address restriction
is not for client IP addresses, only mail host IP addresses. 

-- 
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
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