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[spf-discuss] Re: redirect=%{l}

2006-05-22 13:05:31
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David Saez Padros wrote:
Just playing with BATV i noticed that it could conflict with some (mine
in that case) SPF setups. If i publish SPF records like "v=spf1
redirect=%{l}._spf.ols.es" which use the local part of the envelope
sender to generate a new dns request then batv encoded addresses like
prvs=david/0297929b3b(_at_)ols(_dot_)es produce a dns query on
prvs=david/0297929b3b._spf.ols.es which include two forbiden charactes (=
and /) 

Those characters are NOT illegal in DNS labels.  A domain label may even 
contain dots (".").  See RFC 2181[1].

I noticed that some implementations will just use
david/0297929b3b._spf.ols.es for the query

This is a bug in those implementations.

References:
 1. http://tools.ietf.org/html/2181#page-13

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