If I try to attach inbox mail, encoding becomes broken, besides I can see html tags of the original message, like this:

Content-type: multipart/alternative;

boundary="B_3435585541_80907"


ˇòî ñîîáùåíèå â ôî›ìàòå MIME. ∂îñêîëüêó ï›îã›àììà ÷òåíèß ‡ëåêò›îííîé ïî÷òû íå ›àñïîçíàåò

‡òîò ôî›ìàò, ñîîáùåíèå ìîæåò îêàçàòüñß ÷àñòè÷íî èëè ïîëíîñòüfl íå÷èòàåìûì.


--B_3435585541_80907

Content-type: text/plain;

charset="windows-1251"

Content-transfer-encoding: quoted-printable


=FB=E2=EC=FB=E2=EC=E2=FB=F1=E2=FB=F4

--B_3435585541_80907

Content-type: text/html;

charset="windows-1251"

Content-transfer-encoding: quoted-printable


<html>

<head>

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">

</head>

<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-=

break: after-white-space; color: rgb(31, 73, 124); font-size: 14px; font-fam=

ily: Calibri, sans-serif; ">

<div>

<div>

<div>=FB=E2=EC=FB=E2=EC=E2=FB=F1=E2=FB=F4</div>