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

[webdeal]

I have the same problem. Provider seznam.cz too.

[GamerClassN7]

I have the same problem. Provider seznam.cz too.

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