[139564] in North American Network Operators' Group
Re: Yahoo! Mail Issue
daemon@ATHENA.MIT.EDU (Brielle Bruns)
Tue Apr 12 00:54:09 2011
Date: Mon, 11 Apr 2011 22:54:01 -0600
From: Brielle Bruns <bruns@2mbit.com>
To: nanog@nanog.org
In-Reply-To: <BANLkTikB70gUJ2Hg=4kPi=du=xqEiSEQXg@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 4/11/11 10:47 PM, Matthew Petach wrote:
>
>
> mpetach@opstools1:~> telnet 219.90.94.56 25
> Trying 219.90.94.56...
> Connected to static-host-219-90-94-56.tri.ph.
> Escape character is '^]'.
> ehlo yahoo.com
> 554 SMTP synchronization error
> Connection closed by foreign host.
> mpetach@opstools1:~>
>
>
> I imagine when port 25 stops giving 5xx
> failure message back, mail reception
> might improve. ^_^;
Works fine for me, your getting an error because your trying to send a
command before receiving the first 220, aka RFC violation. As long as
you connect, wait a moment without trying to send a command, your fine.
telnet 219.90.94.56 25
Trying 219.90.94.56...
Connected to static-host-219-90-94-56.tri.ph.
Escape character is '^]'.
220 stluke.com.ph ESMTP MailCleaner (Community Edition 2010 beta 3) Tue,
12 Apr 2011 12:51:38 +0800
My systems do it too if you try to send a command before waiting for the
220s to finish:
telnet mail.sosdg.org 25
Trying 2620:64:0:1::2...
Connected to mail.sosdg.org.
Escape character is '^]'.
554 SMTP synchronization error
Connection closed by foreign host.
Its an effective antispam method, because bots rarely bother to wait.
They just blast away
--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org / http://www.ahbl.org
