RE: mailq lockups - ReadList.com

6 msg	DSN relay host
1 msg	Restrict sender and from to one domain on outbo...
10 msg	Outbound postfix routing issue
25 msg	Problem with Black List
3 msg	Looking at new mail server layout
26 msg	why every minute: 'reload configuration /etc/po...
2 msg	myhostname parameter
17 msg	RBL problems with smarthost on private address ...
34 msg	Backscatting filter?
3 msg	how to setup postfix in 'deliver-only' mode?
7 msg	Slow queue configuration
17 msg	Some Windows SMTP Server have problems with STA...
5 msg	For each check_ns or each check_mx, the value i...
4 msg	postfix and spf
2 msg	Password Validation in postfix
4 msg	catching some spam with warn_if_reject and reje...
9 msg	RFC: Check mail quota at a mail relay (backscat...
31 msg	GPS vs GLD (greylisting)
3 msg	Unmeant update from 2.2.10 to 2.5.1

mailq lockups
\ Joey (5 May 2008)
. \ Victor Duchovni (5 May 2008)
. \ Jan P. Kessler (5 May 2008)
. \ Noel Jones (5 May 2008)
. \ Ralf Hildebrandt (5 May 2008)
. . \ Joey (5 May 2008)
. . . \ Ralf Hildebrandt (5 May 2008)
. . . \ Victor Duchovni (5 May 2008)
. . . \ Noel Jones (5 May 2008)
. . . . \ Joey (6 May 2008)
. . . . . \ Victor Duchovni (6 May 2008)
. . . . . . \ Joey (6 May 2008)
. . . . . . . \ Victor Duchovni (6 May 2008)
. \ Joey (7 May 2008)
. . \ Victor Duchovni (7 May 2008)
. . . \ Joey (8 May 2008)
. . . . \ Victor Duchovni (8 May 2008)
. . . . . \ MacShane, Tracy (9 May 2008)
. . . . . \ Joey (9 May 2008)
. . . . . . \ (Wietse Venema) (9 May 2008)
. . . . . . . \ Joey (9 May 2008)
. . . . . . . . \ (Wietse Venema) (9 May 2008)
. . . . . . . . . \ Joey (13 May 2008)
. . . . . . . . . . \ Victor Duchovni (13 May 2008)
. . . . . . . . . . \ Victor Duchovni (13 May 2008)
. . . . . . . . . . . \ (Wietse Venema) (13 May 2008)
. . . . . . \ Victor Duchovni (9 May 2008)

Subject:	RE: mailq lockups
Group:	Postfix-users
From:	Joey
Date:	9 May 2008

> -----Original Message-----
> From: owner-postfix-users
[mailto:owner-postfix-users]
> On Behalf Of Victor Duchovni
> Sent: Thursday, May 08, 2008 2:02 PM
> To: postfix-users
> Subject: Re: mailq lockups
>
> On Thu, May 08, 2008 at 01:41:06PM -0400, Joey wrote:
>
> > > No it should be "pipelining", because this is a *discard* keywords
list.
> >
> > To keep it simple I took out the pipelining statement as a quick test,
and
> > that didn't work.
>
> How did you do that? What evidence did you collect to check that
PIPELINING
> was not used?

I disabled pipelining for everyone ran some test emails and it worked
exactly the same.

>
> > Is there something from the spamassassin/ anti-spam side that could be a
> > factor in this?
>
> How could this possibly matter? Postfix delivers mail long after all the
> scanning is done. Delivery is just pumping bits out to the network.
>

Based on what I see on the server, emails coming from email addresses that I
know are not valid, email which seems to lockup in the queue seems to be
what I would categorize as spam.

I did some additional tests this morning, and if I emailed directly from the
mailserver to the user on exchange there was no locked up connection on
either side.
Additionally if I sent from gmail to the user the message went right through
again with no lockup either on the postfix or exchange side.

I don't want you to think that I am comfortable and have undisputed facts
here, but this is making more sense in respect to when it happens.

I downloaded and installed some tools for the tcpdump, but haven't had the
chance to play with all of it... I hope to soon.

I also seem to see several from specific domains that lock up, in doing a
whois I see privacy protection and then doing a dig with mx on the domain
look at this result:
flashcomicbooks.com. 7200 IN MX 10
mx152.flashcomicbooks.com.
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;; AUTHORITY SECTION:
flashcomicbooks.com. 7200 IN NS ns0.flashcomicbooks.com.
flashcomicbooks.com. 7200 IN NS ns1.flashcomicbooks.com.

;; ADDITIONAL SECTION:
mx1.flashcomicbooks.com. 7200 IN A 209.222.72.10
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What legit business with exception of a big isp would have that many
mailservers.
Somehow there is something related to spam which is causing the lockup.
I have to play with the tcpdump stuff to try and figure out the next step...