[afrinic-anti-spam-discuss] Mail Server Blocking IP Address

[W W]

Hi Tosin,

Does the client use a router or firewall before connecting to your ISP infra' ?

If Yes, I recommend you deny all mail port communication from entire
LAN to external of client , except for Mail server.

See the result of this and let me know.

In addition, how do you prove the client server is black listed ?
Are you using any specific tool ?

Cheers.
WWM

On 9/11/13, Adeosun Tosin <adeosun at simba.com.ng> wrote:
> Dear Earnest,
>
> I work with an ISP and when we give out public IP to our clients and we
> only
> allow our clients to send mails on port 25 and 587. We don't host mails for
> our clients but we discover of late that our clients IP is not blacklisted
> and the mail server IP is not blacklisted but the clients mail are not
> going
> unless we change their IP address.
>
> More so, we suspect that the mail server is seeing spamms coming in on the
> allowed ports but due to the number of domains configured on the mail
> server, it tends to block the IP block and not the individual user sending
> spamm on that particular port. That was while I said am looking for a
> solution that can block/drop the mail before leaving our network rather
> than
> it affecting our IP on their mail server.
>
> Hope this is explanatory enough.
>
> Regards
>
> Tosin Adeosun
>
> -----Original Message-----
> From: Ernest [mailto:ernest at afrinic.net]
> Sent: 10 September 2013 17:39
> To: Adeosun Tosin
> Cc: 'Anti-spam technical list'
> Subject: Re: [afrinic-anti-spam-discuss] Mail Server Blocking IP Address
>
>> I work with an ISP company and the mail server that is blacklisting the
>> IP
>> is our clients mail server not our own mailserver. Am looking for a
> solution
>> that can drop the mail before leaving our network rather than it
>> affecting
>> out IP on their mail server.
>
> Still a bit confused, sorry.
>
> Please explain the full setup between your mail server and your
> client's to better understand the problem you are facing.
>
> Regards
> Ernest
>
>
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