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

[Adeosun Tosin]

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