  We study quasiparticle spectrum of the correlated quantum dot deposited on
superconducting substrate which is side-coupled to the Rashba nanochain,
hosting Majorana end modes. Ground state of an isolated quantum dot
proximitized to superconducting reservoirs is represented either by the singly
occupied site or BCS-type superposition of the empty and doubly occupied
configurations. Quantum phase transition between these distinct ground states
is spectroscopically manifested by the in-gap Andreev states which cross each
other at the Fermi level. This qualitatively affects leakage of the Majorana
mode from the side-attached nanowire. We inspect the spin-selective
relationship between the trivial Andreev states and the leaking Majorana mode,
considering (i) perfectly polarized case, when tunneling of one spin component
is completely prohibited, and (ii) another one when both spins are hybridized
with the nanowire but with different couplings.
