Possible aid in filtering spam

["Wolfgang S. Rupprecht" at wsrcc.com]

david at catwhisker.org (David Wolfskill) writes:
>    ... To bypass this barrier a special literal form
>    of the address is allowed as an alternative to a domain name.  For
>    IPv4 addresses, this form uses four small decimal integers separated
>    by dots and enclosed by brackets such as [123.255.37.2], which
>    indicates an (IPv4) Internet Address in sequence-of-octets form.  For 
>    ....

What is funny about the spamware authors is that they usually can't be
bothered to even code for proper address literals.  Most of the
numeric HELO's/EHLO's I see are *unbracketed* addresses which I
gleefully drop as being non-RFC conformant.

-wolfgang
-- 
Wolfgang S. Rupprecht                http://www.wsrcc.com/wolfgang/