I would be willing to bet that the "Auto deny hack attempts" is kicking in
here. This will temporarily add their IP address to the access control list
to be denied until the SMTP service is restarted...Check the logs and you
will see this in there if this is what's happening
Eric S
----- Original Message -----
From: "Goran Jovanovic" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, July 22, 2004 10:47 AM
Subject: RE: [IMail Forum] Odd SMTP Connect Problem
Yes that is what it looks like. But how/where is IMail blacklisting it?
Can I change the settings somewhere?
Goran Jovanovic
The LAN Shoppe
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:IMail_Forum-
> [EMAIL PROTECTED] On Behalf Of Travis Rabe
> Sent: Thursday, July 22, 2004 10:45 AM
> To: [EMAIL PROTECTED]
> Subject: RE: [IMail Forum] Odd SMTP Connect Problem
>
> Sounds like Imail is temporarily blacklisting it. The only way to
stop
> that
> is to restart the SMTP service. You may want to look at the logs on
that
> machine to see what is going on.
>
> Travis
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of Goran
Jovanovic
> Sent: Thursday, July 22, 2004 7:38 AM
> To: [EMAIL PROTECTED]
> Subject: [IMail Forum] Odd SMTP Connect Problem
>
> OK this is very weird.
>
> I am running IMail 8.10 and am seeing the following. There is a
> secondary MX record for one of the domains that I service. Someone
seems
> to be sending to it directly and so it sends me a lot of mail for this
> domain (this is not a problem in my mind). The problem is that the
SMTP
> service stops accepting mail from this (and only this IP address) at
> random times. It can work for hours and then fail and the next time I
> restart the service it will work for minutes, completely
unpredictable.
>
> I have done a packet trace at my end and I see:
>
> Them sending a SYN
> I send and ACK
> They send an ACK
> Then I send a FIN
>
> So we never get to the banner being sent out or the helo coming in.
> There is nothing in the log even with debug and verbose turned on.
>
> >From that point on SMTP will not accept a connection from that IP
> address. But, it gets better, all other IPs can connect to the SMTP
> server and still get their mail through. If the other ISP uses another
> machine in the same IP block that machine can connect no problem.
>
> I have increased the SMTP setting for Delay between recipients to 500
> milliseconds but this seems to have no effect.
>
> This is a dedicated machine to IMail.
>
> Does anyone have any ideas on what this might be and how to fix it?
>
> Goran Jovanovic
> The LAN Shoppe
>
>
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