I suppose it would reject backscatter spam but not much else.
Gary
-- Sent from my HP TouchPad
On Jul 6, 2012 4:43 PM, Mark Frater <[email protected]> wrote:
Hi Eric,
I'm talking about sender-verification also known as call-out verification. It can be used for smtp auth or incoming mail or both. This is where the mail server first verifies that the 'sender's address' actaully exists before delivering the message. It does this by connecting to the sender's MX and attempting to send a message to the sender but quitting before the data command. Usually done as follows: helo, mail from: <>, rcpt to: sender@domain, check reply, quit. If 250, sender is verified and the mail is allowed through (and generally the verification result will also be cached for a variable time so as not to be abused in floods etc). The reason why I said this feature is of less importance is because it does have the potential to be abused. Though it seems quite widely used these days.
Regards,
Mark
On 06 Jul 2012, at 10:07 PM, Eric Shubert <[email protected]> wrote:
> Nice suggestions, Mark. Thanks.
>
> On 07/06/2012 12:36 PM, Mark Frater wrote:
>> Lastly and perhaps less as important would be the sender verification process which is listed in the smtp RFC but which qmail has no standard ability to perform. Once again this is a standard feature available in postfix.
>
> Are you talking about smtp-auth capability here, or something else?
> Which RFC/feature?
>
> --
> -Eric 'shubes'
>
>
>
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