[CentOS] dealing with spoofing

[m.roth at 5-cent.us]

Josh Miller wrote:
> On 08/31/2011 01:37 PM, Josh Miller wrote:
>> On 08/31/2011 01:33 PM, m.roth at 5-cent.us wrote:
>>> Josh Miller wrote:
>>>> On 08/31/2011 01:27 PM, m.roth at 5-cent.us wrote:
>>>>> Stephen Harris wrote:
>>>>>>> Here's a thought I just thunk, folks: some scum, apparently in
>>>>>>> eastern Europe, has harvested my email, and is using it in the
>>>>>>> Reply-To: in its spamming efforts. Now, I realize that some
>>> <snip>
>>>>>> Anyway, the SMTP server should send the delivery failure to the
>>>>>> envelope address, which may be different to both the From and
>>>>>> Reply-To addresses.
<snip>
>
> Why don't you use your SPF record to prevent spoofing (to most
> providers...)?
>
>  > dig -t txt 5-cent.us
> ...
> 5-cent.us.              14400   IN      TXT     "v=spf1 a mx ptr
> include:hostmonster.com ?all"
> ...
>
> You have one but you're not using it to prevent spoofing.

Um, because I'm not that deep into that? Thank you, I'll look at setting
that up. One question: is that in my registrar, or my hosting site? Given
it's an MX record, I'm guessing it's the former.

        mark