On Mon, 12 Mar 2012 14:47:41 -0500 (CDT)
David B Funk <dbf...@engineering.uiowa.edu> wrote:

> This concept was discussed/debated on this list about 2 years ago (~
> Apr 2009; search for the subject of "emailBL"). 
> There was some disagreement about how to handle the '@' within
> the context of a DNS record and about privacy/security issues.

In the case of APER, the entire list is publicly downloadable, so I don't
think making it available via DNS introduces any additional privacy issues.

Handling '@' within a DNS record is a solved problem (see the SOA record).
You just replace it with a '.'

If we were worried about the (extremely unlikely) clash between
"b...@sub.example.org" and "bob....@example.org", we could just use the
sha1sum of the lower-cased email address as the DNS lookup key.

Regards,

David.

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