Message-ID being stripped from header?

Hello all,

I recently performed an update installation of SpamAssassin-3.2.4 and
qmail-scanner 1.24 to their latest versions -- 3.2.5 and 2.04 --
respectively.  After doing the update, I noticed that for most of my
mails (not all of them) now have their Message-IDs removed, and
SpamAssassin is tagging them with MISSING_MID.

I checked to make sure that the actual incoming mails have Message-IDs
by using tcpdump, and looked at the packets coming from the remote
host.  Here is just one example:

     0x00e0:  2e69 6e66 6f3e 0d0a 582d 5072 696f 7269  .info>..X-Priori
     0x00f0:  7479 3a20 3320 284e 6f72 6d61 6c29 0d0a  ty:.3.(Normal)..
     0x0100:  4d65 7373 6167 652d 4944 3a20 3c39 3037  Message-ID:.<907
     0x0110:  3534 3133 3733 342e 3230 3038 3036 3139  5413734.20080619
     0x0120:  3037 3238 3238 4061 7061 782e 636f 6d2e  [email protected].
     0x0130:  686b 3e0d 0a54 6f3a 203c 6d69 6b65 4074  hk>..To:.<mike@t
     0x0140:  6564 6465 722e 6363 3e0d 0a53 7562 6a65  edder.cc>..Subje
     0x0150:  6374 3a20 6d61 6769 6c70 2070 6f74 6368  ct:.magilp.potch

And here is the same portion of the mail header, as displayed by my
mail client:

     X-Priority: 3 (Normal)
     To: mike@[..removed..]
     Subject: magilp potch

So, knowing that the incoming data indeed has a valid Message-ID, the
culprit here is either SpamAssassin or qmail-scanner.  Nothing else
has changed on my system.

I have qmail-scanner set up to run SpamAssassin in verbose mode (rather
than fast), so the incoming mail is overwritten by spamc.  It's possible
SpamAssassin itself could be stripping the Message-ID from the mail,
but it is also reporting MISSING_MID, so I'm a bit confused as to where
the problem is.

Has anyone experienced anything like this, or have any suggestions to
where to start checking further?

-- 
- breakpoint / brainstorm

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