Strange aaazzzaaazzz junks

[Xin LI <delphij@xxxxxxxxxxxxx>]

Hi everyone,

I have noticed that two of postfix+mailman deployments (one is FreeBSD.org
and another is postifix.org) sends something like "aaazzzaaazzzaaazzz" when
it is sending ordinary mails.

As far as I can tell (and with kind help of FreeBSD.org's postmaster):
	o The mail is actually logged by postfix.
	o Most times it contains no header information, and just some
	  aaazzz's.
	o Sometimes, the outgoing mail even does not conform RFC2821,
	  for example, no "EHLO" or "RCPT" is sent before it is sending
	  data
	o The remote (say, the server sending aaazzz's) is dealing
	  with bounces correctly.  With a strict RFC2821 check on
	  my mail server, these mail will finally bounced and my
	  subscription is being disabled due to this issue.

I have noticed this phenomena about one year ago and I used to consider
this a FreeBSD.org specific issue.  However, unfortunatelly, I found that
there are some logs saying that postfix.org is sending these today.

If this is a common issue, I think it would be valuable to investigate
more deeply.

Some of my logs is as follows:

Sep  1 22:25:52 beastie postfix/smtpd[497]: warning: Unable to look up NS host dnsauth3.sys.gtei.net for Helo command english-breakfast.cloud9.net: Host not found
Sep  1 22:25:52 beastie postfix/smtpd[497]: 01265130E45: client=english-breakfast.cloud9.net[168.100.1.9]
Sep  1 22:25:52 beastie postfix/cleanup[486]: 01265130E45: message-id=<20040901142345.01265130E45@xxxxxxxxxxxxxxxxxxxxx>
Sep  1 22:25:52 beastie postfix/cleanup[486]: 01265130E45: discard: body aaazzzaaazzzaaazzzaaazzzaaazzz from english-breakfast.cloud9.net[168.100.1.9]; from=<owner-postfix-users@xxxxxxxxxxx> to=<delphij@xxxxxxxxxxxxx> proto=ESMTP helo=<english-breakfast.cloud9.net>: "aaazzz Junk"
Sep  1 22:29:05 beastie postfix/smtpd[497]: disconnect from english-breakfast.cloud9.net[168.100.1.9]

My own server is runninng postfix 2.1.4 with TLS configuration.  My
time zone is GMT+08:00.

The problem is really strange, but as I stated at the beginning of this
letter, this is more likely a postfix issue rather than a mailman issue,
as it seems that the remote client is actually dealing with bounces.

If there is anything I did not described clearly, please let me know.
Additional information is available upon request.

Thanks in advance!

Cheers,
-- 
Xin LI <delphij frontfree net>	http://www.delphij.net/
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