Multiple SOA records? - ReadList.com

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Multiple SOA records?
\ Lars Hecking (6 May 2008)
. \ Kevin Darcy (6 May 2008)
. . \ Lars Hecking (6 May 2008)
. . . \ Kevin Darcy (6 May 2008)
. . . . \ Lars Hecking (7 May 2008)
. . \ Lars Hecking (7 May 2008)
. . . \ Chris Buxton (7 May 2008)
. . . \ Kevin Darcy (7 May 2008)
. \ Chris Thompson (7 May 2008)

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Subject:	Multiple SOA records?
Group:	Bind-users
From:	Lars Hecking
Date:	6 May 2008

RFC 1935 says:

2. Exactly one SOA RR should be present at the top of the zone.

Note: "should", not "must".

What kind of consequences can I expect trying to resolve records in a
domain that has more than one SOA? The domain that is making problems
is traininghott.com. Querying for its SOAs returns SERVFAIL, but querying
the domain's name servers directly returns two (different) SOAs. This
appears to create problems with mail (not sure here - another entity in
my organisation is experiencing the problem).