1786248 - The attachment gets into the e-mail text body when message forwarding UUEncoded message

Status: NEW

(Thunderbird :: Message Reader UI, defect)

Description

[Adam Bodor]

Attachment: thunderbird-header-begin-end.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0

Steps to reproduce:

When open the e-mail, all right.
When I click the forward button then the attachment gets into the e-mail text body.

Actual results:

I checked the original message header and I founded the strange in the message source. The attachment is between begin and end.
Seen the message under this sentence.

Message-ID: <*****@lidl.hu>
From: *@lidl.hu
To: ***@naszalytej.hu
Subject: Bestellung_LIDL_Ecser_094426072202
Date: Fri, 22 Jul 2022 10:34:51 +0200
X-$MP.ExecutedServices.L-CS90: (10) Check for password protected archives and files;(15) Check password protected PDF documents;(25) Virus Scan AVIRA - incoming;(47) General MailSplit;(1000) Find user's internet address
X-Spamd-Bar: /
Authentication-Results: ns.dej.biz;
dkim=pass header.d=lidl.hu header.s=16lidl header.b=TS4w8D92;
spf=pass (ns.dej.biz: domain of ***@lidl.hu designates 185.124.192.54 as permitted sender) smtp.mailfrom=@lidl.hu;
dmarc=pass (policy=none) header.from=lidl.hu
X-Spam-Status: No, score=-0.91

begin 600 Bestellung_LIDL_Ecser_094426072202.pdf

M)5!$1BTQ+C4-)>+CS],-"C$@,"!O8FH-/#PO0W)E871I;VY$871E("A$.C(P
M,C(P-S(R,#@S-#0W6CP)SP)RDO36]D1&%T92H1#HR,#(R,#<R,CX,S0T
M-UHP,"<P,"<I+U!R;V1U8V5R("A01$94<F]N(%!$1DYE="P@5C8N,SR-S)< M;BD^/@UE;F1O8FH-,BP(&]B:@T/"]086=E<RS(#@4B]4>7!E("]#871A
M;&]G+U9E<G-I;VX@+S$N-#X^#65N9&]B:@TU(#@;V)J#3P\+T9I;'1E<BO
M1FQA=&5$96-O9&4O3&5N9W1H(#(U-S0O3B`S/CX-<W1R96%M"DB)G)9Y5%-W

end

Expected results:

When I read the message I see the attachment good but I try forwarding the message then the attachment gets into the e-mail text body.
The bug is thunderbird 102 (stable) and 104 (beta) version too.

Comment 1

[Adam Bodor]

Attachment: Screenshot 2022-08-22 135339.png

After I click the forward button

Comment 2

[Adam Bodor]

Attachment: Bestellung_LIDL_Ecser_094424082201.eml

This is the original message.
If you open and click forward button you run into the reported bug.