[Evolution] mulipart message headers missing/not visible to filters???

[Reid Thompson <Reid Thompson ateb com>]

EVO 3.2.4
EWS
In the example portion of an email below, if I attempt to filter on
Content-Type: text/calendar the filter is never applied (per the evo
filters log).  If I filter on Content-Type: multipart/alternative or
other headers in the topmost header section, the filter is applied.
Should headers from the multipart segments be visible to the filters?

I'd like to have a filter that only applies to emails with Content-Type:
text/calendar matches  -- as it is now, I have match all Content-Type:
multipart/alternative emails in order to catch the text/calendar emails.


Received: from some.exch.server.com ([::1]) by some.exch.server.com ([::1])
 with mapi id 14.01.0355.002; Thu, 19 Jan 2012 11:34:41 -0500
From: G Steir <G Steie xxxxxxxx com>
To: Reid Thompson <Reid Thompson zzzzzzz com>
Subject: test
Thread-Topic: test
Thread-Index: AczWyDV6EdiFsQrHQjit0x6kmrwdgwAAAgyA
Date: Thu, 19 Jan 2012 16:34:41 +0000
Message-ID: <C20DEE1B22F3584293C8B6EF273D351227CD7A75 some exch server com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Exchange-Organization-AuthAs: Internal
X-MS-Exchange-Organization-AuthMechanism: 04
X-MS-Exchange-Organization-AuthSource: some.exch.server.com
X-MS-Has-Attach: 
X-MS-Exchange-Organization-SCL: -1
X-MS-TNEF-Correlator: 
x-originating-ip: [172.16.48.115]
Content-Type: multipart/alternative; boundary="_002_C20DEE1B22F3584293C8B6EF273D351227CD7A75sr101exch1atebc_"
MIME-Version: 1.0
X-Evolution-Source: 1321906405 19378 1 raker2


--_002_C20DEE1B22F3584293C8B6EF273D351227CD7A75sr101exch1atebc_
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64

SOME ENCODED MESSAGE PART 9fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KRnJvbTog
UmVpZCBUaG9tcHNvbiANClNlbnQ6IFRodXJzZGF5LCBKYW51YXJ5IDE5LCAyMDEyIDk6MzggQU0N
ClRvOiBFbGxlbiBUaG9tcHNvbjsgSmFrZSBUaG9tcHNvbjsgTWFnZ2llIFRob21wc29uOyBKIFJl
aWQgVGhvbXBzb247IFNoYW5ub24gRGV2aW5lOyBKb3kgVGhvbXBzb247IEppbW15IEJvZXJpY2tl
OyBBbHVuIFByeXRoZXJjaDsgR2VvcmdlIFN0ZWlnZXJ3YWx0OyBKb2huIEZhbnNsZXI7IEJyeWFu
LlNtaXRoDQpTdWJqZWN0OiBhcyBpbmZvDQoNCg0KaHR0cDovL21hcHMuaHVnZS5pbmZvL3ppcC5o
dG0NCg0KDQo=

--_002_C20DEE1B22F3584293C8B6EF273D351227CD7A75sr101exch1atebc_
Content-Transfer-Encoding: base64
Content-Type: text/calendar

THE ENCODED CALENDAR PART OF THE MESSAGE A0KUFJPRElEOk1pY3Jvc29mdCBFeGNoYW5n
ZSBTZXJ2ZXIgMjAxMA0KVkVSU0lPTjoyLjANCkJFR0lOOlZUSU1FWk9ORQ0KVFpJRDpFYXN0ZXJu
IFN0YW5kYXJkIFRpbWUNCkJFR0lOOlNUQU5EQVJEDQpEVFNUQVJUOjE2MDEwMTAxVDAyMDAwMA0K
VFpPRkZTRVRGUk9NOi0wNDAwDQpUWk9GRlNFVFRPOi0wNTAwDQpSUlVMRTpGUkVRPVlFQVJMWTtC
...snip...