  We study Majumdar-Papapetrou solutions for the 3+1 Einstein-Maxwell
equations, with charged dust acting as the external source for the fields. The
spherically symmetric solution of G\"{u}rses is considered in detail. We
introduce new parameters that simplify the construction of class $C^1$,
singularity-free geometries. The arising sources are bounded or unbounded, and
the redshift of light signals allows an observer at spatial infinity to
distinguish these cases. We find out an interesting affinity between the
conformastatic metric and some homothetic, matter and Ricci collineations. The
associated non-Noetherian symmetries provide us with distinctive solutions that
can be used to construct non-singular sources for Majumdar-Papapetrou
spacetimes.}
