Strange quote rendering in moderator email

[ForNeVeR]

Today I've received a email with the following body from loglist:

Message-ID: <[REDACTED]>
Subject: LogList Suggested Quote: https://t.me/radio_t_chat/65425
Return-Path: [REDACTED]
X-Yandex-Forward: [REDACTED]

Grigory
 Bakunov, [11.07.2...
MIME-Version: 1.0
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable



<a href=3D"http://loglist.xyz/quote/approve?[REDACTED]=
[REDACTED]">Manage the Suggested Quote</a>
<pre>https://t.me/radio_t_chat/65425

Grigory Bakunov, [11.07.20 22:43]
=D0=BA=D0=B0=D0=BA =D0=B6=D0=B5 =D0=B1=D0=BB=D0=B8=D0=BD =D1=85=D0=BE=D1=80=
=D0=BE=D1=88=D0=BE =D1=81 =D0=B5=D0=BC=D0=B0=D0=BA=D1=81=D0=BE=D0=BC =D0=B2=
=D1=81=D0=B5=D0=B3=D0=B4=D0=B0. =D0=B8=D0=BD=D0=BE=D0=B3=D0=B4=D0=B0 =D0=BF=
=D1=80=D1=8F=D0=BC=D0=BE =D0=BA=D0=B0=D0=BA =D1=81=D0=B5=D0=BA=D1=81</pre>
<pre>(Source: user)</pre>

In my email clients (both Yandex web mail client and Mailspring) it got rendered as this:

It obviously tried to send a HTML message, but something was very mangled during the sending. Looks like the (multi-line?) subject was somehow interleaved with the actual message body: probably the subject was meant to be "https://t.me/radio_t_chat/65425 Grigory Bakunov, [11.07.2...", but the mail server has inserted its headers in between the subject lines, so the message structure was completely destroyed, and the headers Content-Type and Content-Transfer-Encoding went to the message body instead of the message header.

The Unicode message text then got broken due to missing Content-* headers.

Probably, it has something to do with the link in the first line of the message? Dunno.

For comparison, here's a non-broken message I've received a while ago:

Message-ID: <[REDACTED]>
Subject: =?UTF-8?Q?LogList_Suggested_Quot?=
 =?UTF-8?Q?e:_=D0=A2=D0=B8=D0=BC=D0=B5=D1=80=D0=BB=D0=B0=D0=BD,_[07.07.20?=
 =?UTF-8?Q?_20:05]=0D=0A=D0=A0=D0=B5?=
 =?UTF-8?Q?=D0=B1=D1=8F=D1=82_=D0=B5=D1=81=D1=82=D1=8C_=D0=B2=D0=BE?=
 =?UTF-8?Q?=D0=BF=D1=80=D0=BE=D1=81.=D0=B7=D0=BD=D0=B0=D1=8E:=0D?=
 =?UTF-8?Q?=0A_=D1=86=D0=B8=D0=BA=D0=BB=D1=8B,...?=
MIME-Version: 1.0
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-Path: [REDACTED]
X-Yandex-Forward: [REDACTED]



<a href=3D"http://loglist.xyz/quote/[REDACTED]=
[REDACTED]">Manage the Suggested Quote</a>
<pre>=D0=A2=D0=B8=D0=BC=D0=B5=D1=80=D0=BB=D0=B0=D0=BD, [07.07.20 20:05]
=D0=A0=D0=B5=D0=B1=D1=8F=D1=82 =D0=B5=D1=81=D1=82=D1=8C =D0=B2=D0=BE=D0=BF=
=D1=80=D0=BE=D1=81.=D0=B7=D0=BD=D0=B0=D1=8E:
 =D1=86=D0=B8=D0=BA=D0=BB=D1=8B,=D0=BC=D0=B0=D1=81=D1=81=D0=B8=D0=B2=D1=8B =
=D0=BE=D0=B1=D1=8A=D0=B5=D0=BA=D1=82=D1=8B,=D1=84=D1=83=D0=BD=D0=BA=D1=86=
=D0=B8=D0=B8,DOM.=D0=B4=D0=BE=D1=81=D1=82=D0=B0=D1=82=D0=BE=D1=87=D0=BD=D0=
=BE =D0=BB=D0=B8 =D0=B7=D0=BD=D0=B0=D0=BD=D0=B8=D0=B9,=D1=87=D1=82=D0=BE=D0=
=B1 =D0=B7=D0=B0=D0=BF=D0=B8=D0=BB=D0=B8=D1=82=D1=8C =D0=BF=D1=80=D0=BE=D1=
=81=D1=82=D0=BE=D0=B9 =D0=BF=D1=80=D0=BE=D0=B5=D0=BA=D1=82?=D0=BC=D0=BE=D0=
=B3=D1=83 =D0=BB=D0=B8 =D1=8F =D1=81=D1=87=D0=B8=D1=82=D0=B0=D1=82=D1=8C=D1=
=81=D1=8F junior js dev?

Igor N, [07.07.20 20:14]
[In reply to =D0=A2=D0=B8=D0=BC=D0=B5=D1=80=D0=BB=D0=B0=D0=BD]
=D0=9D=D0=B0=D0=B7=D0=BD=D0=B0=D1=87=D0=B0=D1=8E =D1=82=D0=B5=D0=B1=D1=8F j=
unior js dev&#x27;=D0=BE=D0=BC. =D0=9C=D0=BE=D0=B6=D0=B5=D1=88=D1=8C =D0=BF=
=D0=B8=D0=BB=D0=B8=D1=82=D1=8C =D0=BF=D1=80=D0=BE=D1=81=D1=82=D0=BE=D0=B9 =
=D0=BF=D1=80=D0=BE=D0=B5=D0=BA=D1=82.</pre>
<pre>(Source: user)</pre>

[ForNeVeR]

@rexim, sorry to bother you, but have you, too, received this message in broken form? I wonder if it's something about my email provider or about the loglist itself.

[ForNeVeR]

I am able to replicate this effect on some of the newly posted quotes, but not on any one. Further investigation is required.

[rexim]

@ForNeVeR yes, I've seen it too. Super weird.