CNAME records in place of A records

[Dovid Bender <dovid () telecurve com>]

Hi,

Sorry if this is a bit OT. Recently several different vendors (in
completely different fields) where they white label for us asked us to
remove A records that we have going to them and replace them with CNAME
records. Is there anything *going around* in the security aranea  that has
caused this?