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

[Joel Gogwim]

Hi Tosin,
The error message(s) from the client's mail server will also help you know the exact problem, since their mails were going out initially. However, you said "unless we change their IP address" to what IP network do you change their IPs? Are the using dynDNS? Though often for dynDNS the IP(s) got blacklisted.

Joel Gogwim.
ICT Directorate
University of Jos, Nigeria.



----- Original Message -----
From: "W W" <wanyalanabi at gmail.com>
To: "Anti-spam technical list" <anti-spam at afrinic.net>
Sent: Thursday, August 21, 2014 10:22:36 PM
Subject: Re: [afrinic-anti-spam-discuss] Mail Server Blocking IP Address

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
>
>
> _______________________________________________
> anti-spam mailing list
> anti-spam at afrinic.net
> https://lists.afrinic.net/mailman/listinfo.cgi/anti-spam
>


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