"Hubbard, David" wrote:
>
> Check the logging from your tcpserver on port 25, if
> you see a lot of status 256's over and over, like one
> to ten per second, then it could be a broken Microsoft
> SMTP Service server trying to deliver mail to you. MS's
> SMTP Service tries to send emails without the
> qmail-required carriage return line feed (\r\n) on the
> end of the lines so the connection is rejected with a
> 442 (number may be wrong) error, a code to tell the
> server to retry again later. Sometimes these stupid
> servers will instead start retrying as often as they
> can make connections given the available bandwidth. One
> of my qmail servers is on an OC3 and I was seeing about
> 10 connections per second from one of these machines
> which took up quite a bit of bandwidth.
>
> Here's the MS article:
>
> http://support.microsoft.com/support/kb/articles/Q224/9/83.ASP
>
> Dave
>
I agree that it's probably that; it already happened to me a couple of
times. The last time, I found out by doing a netstat during several days
when the incoming traffic was unusually high and finding out one SMTP
connection that didn't die and was always there, even when there wasn't
any other traffic. I connected to the port 25 of that host, and what did
I find?
"Microsoft SMTP MAIL ready blah blah blah..."
Paulo Jan.
DDnet.
