[Mailman-Developers] [ mailman-Bugs-617930 ] MIME handling very dumb, breaks messages

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Bugs item #617930, was opened at 2002-10-03 00:14
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100103&aid=617930&group_id=103

Category: mail delivery
Group: 2.0.x
Status: Open
Resolution: None
Priority: 5
Submitted By: Dylan Griffiths (inoshiro)
Assigned to: Nobody/Anonymous (nobody)
Summary: MIME handling very dumb, breaks messages

Initial Comment:
Mailman delivered a partially garbled message on a
mailing list today because it doesn't handle
non-text/plain messages.  The incoming message was:
Content-Transfer-Encoding: base64
Content-Type: text/plain;charset="utf-8"

So the content was something like this:
QW55b25lIG91dCB0aGVyZSB1c2luZyBNUlRHIHRvIGNvbGxlY3Qgcm91dGVyIGRhdGEgLCBJZiBz
byB3aGF0IGtpbmQgb2YgYmFja2VuZA0KYXJlIHlvdSB1c2luZyBJIGFtIHRyeWluZyB0byBjb25m
aWcgaXQgdG8gdXNlIHBvc3RncmVzICwgYW55IGhpbnRzIG9yIHRpcHMgYXMgdG8gdGhlIGJlc3Qg
d2F5IHRvIGdvIGFib3V0IHRoaXMNCiANCiANCiANCg==

To which Mailman blindly attached a text/plain
signature (rather than another mime section and marking
the body as mixed), which then decodes in any MIME
aware mailreader as a large blob of lower-ASCII crap:

I�$j�(�������Lj)b���"�;
���Z��ݞ����{����z(�X��קZ��r�}:-��ej^��+
���+��b�v���m��b�֧v˛���ب�f�j�z{`��zm���a���o�j)
fj��b��?slg=

Please adjust the behaviour to not append a signature
if it can't attach it in such a way that data is not
garbled.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100103&aid=617930&group_id=103