Subject is not decodet properly

[GamerClassN7]

Describe the bug subject is displayed as =?utf-8?q?Fwd=3A_Re=3A_Nov=C3=BD_koment=C3=A1=C5=99_u_=23PK-207_-?= =?utf-8?q?_Chybn=C3=A9_filtrov=C3=A1n=C3=AD?= insetad of Fwd: Re: Nový komentář u [#PK-207] - Chybné filtrování

Used config defaultg.

Code to Reproduce The troubling code section which produces the reported bug.

$email->getSubject()->toString()

Expected behavior returnn insetad of Fwd: Re: Nový komentář u [#PK-207] - Chybné filtrován`

Screenshots none

Desktop / Server (please complete the following information):

• OS: UBUNTU @$
• PHP: *.$.#
• Version ^6.2
• Provider seznam.cz

Additional context none