On Thursday 16 October 2003 19:14, Meng Weng Wong wrote:
We need to let individual users opt out of the system; symmetrically, we
need a way for SPF to be disabled by default but let individual users
opt in.
...<snip>...
If a roaming user (bob(_at_)example(_dot_)com) wishes to be able to use any
SMTP
server at all, example.com can publish a LocalPart directive.
Big problem
Many DNS admins forget to disable general AXFR for their zonefile.
Result: You have just published a list of addresses spammers can use to
circumvent SPF.
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