Re: [Asrg] 0. General - Inquiry about CallerID Verification

["Jon Kyme" <jrk@merseymail.com>]

> > 
> 
> RFC 2821 states  (sections 3.3, 4.1.1.4 and 6.1) that the SMTP server 
> has two options: accept or reject the message, and has two options to 
> send back OK or Failure (5xx). HOWEVER, once the message has been 
> accepted as per this section (6.1):
> 
> "  When the receiver-SMTP accepts a piece of mail (by sending a "250 OK"
>     message in response to DATA), it is accepting responsibility for
>     delivering or relaying the message.  It must take this responsibility

[snip]

>     If there is a delivery failure after acceptance of a message, the
>     receiver-SMTP MUST formulate and mail a notification message.  This
> Therefore, the RFC does dictate what should been done with the message 
> once it has been filtered. Even though many anti-spam systems honor this 
> "in breach", this is another illustration of how protocols affect other 
> things, even filtering.
> 

Absolutely, but of course it's not clear that any recipient or
administratively authorised disposition of the message can count as
"delivery failure". I'm not sure that silent failures due to filtering
*are* contrary to this recommendation.
Some say it's better for rejection to be earlier and explicit, but
successfully delivering to /dev/null isn't prohibited anywhere I can think
of.
  




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