Dropping email on the floor?

[Jeff Kinz]

Hi Guys,
I've just recently started seeing large numbers of emails being dropped,
but only from specific sources

Here is what sendmail verbose mode is showing (two examples):

26969 >>> 220 redline.kinz.org ESMTP Sendmail 8.11.6/8.11.6; Fri, 15 Apr
2005 13:29:23 -0400
26969 <<< EHLO nl-mail5.internet.com
26969 >>> 250-redline.kinz.org Hello nl-mail5.internet.com [64.62.164.185], pleased to meet you
26969 >>> 250-ENHANCEDSTATUSCODES
26969 >>> 250-8BITMIME
26969 >>> 250-SIZE
26969 >>> 250-DSN
26969 >>> 250-ONEX
26969 >>> 250-ETRN
26969 >>> 250-XUSR
26969 >>> 250-AUTH GSSAPI
26969 >>> 250 HELP
26969 <<< MAIL FROM:<newsletter at nl.internet.com>
26970 >>> 250 2.1.0 <newsletter at nl.internet.com>... Sender ok
26970 <<< [EOF]
26970 >>> 421 4.4.1 redline.kinz.org Lost input channel from nl-mail5.internet.com [64.62.164.185]
26968 >>> 220 redline.kinz.org ESMTP Sendmail 8.11.6/8.11.6; Fri, 15 Apr 2005 13:29:25 -0400
26968 <<< HELO n19a.bulk.scd.yahoo.com
26968 >>> 250 redline.kinz.org Hello n19a.bulk.scd.yahoo.com [66.94.237.48], pleased to meet you
26968 <<< MAIL FROM:<sentto-311578-3615-1113585173-jkinz=kinz.org at returns.groups.yahoo.com>
26971 >>> 250 2.1.0 <sentto-311578-3615-1113585173-jkinz=kinz.org at returns.groups.yahoo.com>...  Sender ok
26971 <<< RSET
26971 >>> 250 2.0.0 Reset state
26968 <<< QUIT
26968 >>> 221 2.0.0 redline.kinz.org closing connection


There seem to be two failure modes, one is the "Lost input channel" and
the other is getting a SMTP "RSET" command from the MTA of the sending
side.

NOTE: "<<<" seems to indicate messages sent by the external SMTP party and
">>>" seems to indicate responses by my side (the "inside")


Any suggestions would be appreciated.  

NOTE:  Comcast is having DNS server problems, Can that be affecting
this? and if so, why only for internet.com and yahoo groups bulk mail
servers?


ONEMORENOTE:
I have turned off all my sorbs style email blocking while trying to
figure this out.  It seems to make no difference.  FPIA

TIA

-- 

http://kinz.org
http://www.fedoranews.org
Jeff Kinz, Emergent Research, Hudson, MA.