On Mon, Nov 03, 2008 at 05:56:48PM -0500, Terry Carmen wrote:
> >The destination system is not Postfix. The sending system is experiencing
> >connection problems. We don't know anything about configured concurrency
> >limits, volumes, ... the OP has provided only minimal information.
>
> Sorry, I
Victor Duchovni wrote:
Is there any chance you could get them to try installing something like
fail2ban, which can block connections from IPs that are doing the
dictionary attacks?
Trying to fix postfix to handle a DOS attack would seem to be more
difficult than preventing it in the first pla
On Mon, Nov 03, 2008 at 04:33:47PM -0500, Terry Carmen wrote:
> Is there any chance you could get them to try installing something like
> fail2ban, which can block connections from IPs that are doing the
> dictionary attacks?
>
> Trying to fix postfix to handle a DOS attack would seem to be mor
Vintinner, M. Scott wrote:
One of our very important clients (a major bank), is having ongoing
problems with denial-of-service style dictionary SPAM attacks. Their
anti-spam/firewall teams are slow to respond to these outbreaks, so
there may be periods of several hours where we will get frequen
On Mon, Nov 03, 2008 at 12:02:59PM -0800, Jay Chandler wrote:
>
> On Nov 3, 2008, at 10:32 AM, Victor Duchovni wrote:
>
> >
> >smtp-finger: Connected to wec-imail1.wachovia.com[169.200.91.91]:25
> >smtp-finger: < 220 wec-imail1.wachovia.com ESMTP Ready.
> >smtp-finger: > EHLO hqmtaint02.ms.com
>
On Nov 3, 2008, at 10:32 AM, Victor Duchovni wrote:
smtp-finger: Connected to wec-imail1.wachovia.com[169.200.91.91]:25
smtp-finger: < 220 wec-imail1.wachovia.com ESMTP Ready.
smtp-finger: > EHLO hqmtaint02.ms.com
smtp-finger: < 250-wec-imail1.wachovia.com Hello hqmtaint02.ms.com
[205.228.53
On Fri, Oct 31, 2008 at 06:44:50PM -0400, Vintinner, M. Scott wrote:
> The result is that some really unlucky messages end up being delayed by
> an hour or more. In the meantime, the client receives messages from
> other companies with only minor delays, so the client and my boss both
> blame our
On Fri, Oct 31, 2008 at 07:42:59PM -0400, Vintinner, M. Scott wrote:
> When their servers are experiencing an "outage" , I see:
>
> Oct 28 09:24:41 mta1 postfix/smtp[24419]: connect to
> wec-imail1.bank.com[xxx.xxx.91.91]: Connection refused (port 25)
Connection refused is not what you would exp
-wide email warning their clients about it. As I
said, I'm pretty confident that the problem is on their end.
-Scott
-Original Message-
From: Terry Carmen [mailto:[EMAIL PROTECTED]
Sent: Friday, October 31, 2008 7:04 PM
To: Vintinner, M. Scott
Cc: postfix-users@postfix.org
Subject: Re: A
Vintinner, M. Scott:
> One of our very important clients (a major bank), is having ongoing
> problems with denial-of-service style dictionary SPAM attacks. Their
> anti-spam/firewall teams are slow to respond to these outbreaks, so
> there may be periods of several hours where we will get frequen
Vintinner, M. Scott wrote:
One of our very important clients (a major bank), is having ongoing
problems with denial-of-service style dictionary SPAM attacks. Their
anti-spam/firewall teams are slow to respond to these outbreaks, so
there may be periods of several hours where we will get frequen
One of our very important clients (a major bank), is having ongoing
problems with denial-of-service style dictionary SPAM attacks. Their
anti-spam/firewall teams are slow to respond to these outbreaks, so
there may be periods of several hours where we will get frequent
connection refused messages
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