Weird files in /var/spool/postfix/maildrop

[Jason Balicki]

I asked about this once before, but the problem seemed like a fluke
so I didn't push the issue.  Well, it's back.

I'm getting some weird files popping up in /var/spool/postfix/maildrop
which is the delivery queue:

mail maildrop # pwd
/var/spool/postfix/maildrop
mail maildrop # ls -l
total 40
-rwxr--r--    1 postfix  postdrop       36 Sep 26 04:01 067762EC19B
-rwxr--r--    1 postfix  postdrop       36 Sep 26 03:32 0DFA72EC19A
-rwxr--r--    1 postfix  postdrop       36 Sep 25 15:47 143D32EC195
-rwxr--r--    1 postfix  postdrop       36 Sep 24 21:15 63F912EC191
-rwxr--r--    1 postfix  postdrop       36 Sep 24 17:40 6F18F2EC18F
-rwxr--r--    1 postfix  postdrop       36 Sep 25 17:48 76BD02EC197
-rwxr--r--    1 postfix  postdrop       36 Sep 25 16:46 B9CB12EC196
-rwxr--r--    1 postfix  postdrop       36 Sep 24 21:28 C62BA2EC192
-rwxr--r--    1 postfix  postdrop       36 Sep 25 19:47 CA4B22EC198
-rwxr--r--    1 postfix  postdrop       36 Sep 26 02:44 CE5612EC199

Each file has the same contents:

mail maildrop # file 067762EC19B
067762EC19B: data
mail maildrop # cat 067762EC19B
F
 MailScannerSM              0XE

And in my logs, I get (many times, for each file):

Sep 26 09:12:59 mail postfix/pickup[20381]: warning: maildrop/067762EC19B:
No recipients specified

The funny thing is, I can't find where these files enter the system.
I keep logs going back for 8 days and there's no mention of these
files except for the postfix/pickup warnings.

mail maildrop # ls -l /var/log/mail.log*
-rw-r-----    1 root     adm       1994410 Sep 26 09:16 /var/log/mail.log
-rw-r-----    1 root     adm       3285694 Sep 25 23:59 /var/log/mail.log.0
-rw-r-----    1 root     adm        317627 Sep 25 00:00
/var/log/mail.log.1.gz
-rw-r-----    1 root     adm        218594 Sep 23 23:59
/var/log/mail.log.2.gz
-rw-r-----    1 root     adm        168074 Sep 23 00:00
/var/log/mail.log.3.gz
-rw-r-----    1 root     adm         67781 Sep 21 23:58
/var/log/mail.log.4.gz
-rw-r-----    1 root     adm         89634 Sep 20 23:57
/var/log/mail.log.5.gz
-rw-r-----    1 root     adm        222786 Sep 19 23:59
/var/log/mail.log.6.gz
mail maildrop # zgrep 067762EC19B /var/log/mail.log*.gz
mail maildrop #
mail maildrop # grep 067762EC19B /var/log/mail.log.0 | grep -v recip
mail maildrop # grep 067762EC19B /var/log/mail.log | grep -v recip
mail maildrop #

Also:
mail maildrop # find /var -name 067762EC19B -print
/var/spool/postfix/maildrop/067762EC19B
mail maildrop #

There's only a couple a day, but I can't find where these are
coming from.  That bothers me a bit.  The only clue I'm given
is in the contents of each file, but I don't know if that's
meaningful either.  If I delete them, it doesn't seem to have
any impact on the system whatsoever (except, of course, pickup
stops complaining).  (None of the other logs in /var/log have
anything in them about these files either.)

Does anyone have any ideas here?  Where else can I look?  To me,
it looks like MailScanner is generating these files and putting
them in maildrop, but I don't know enough about the internals
of MS to figure out where that could be happening.

Anyway, I appreciate any and all help I could be given on
this matter.

--J(K)