Have you tried a DNS round robin solution?
On 05/21/2012 03:06 PM, fmende...@terra.com wrote:
Hello
Eric, thanks for your reply.
We do not have spam issues with our customers, what we have is a
high volume due to large clients number.
All meassures to void spam sending are taken, but the blocks are
being generated for large volume send from just a bunch of IPs (5)
which are the number of mta's qmt in our cluster. As all you may
know, having 9k clients with at least 4 email accounts per client
and a limit of 350 per hour per account, it is still a big traffic
generated.
So I am looking forward to have better service on delivery having
in mind that custmer number is growing fast and anti-spam messures
do its job preatty good. But of the lack of IP on each mta in
cluster, it is affecting delivery.
Hope someone around may share a solution.
Thanks.
On lun 21/05/12 4:55 PM , Eric
Shubert e...@shubes.net sent:
I
don't know if rotating addresses is the best solution or not.
It's
certainly not practical for small QMT installations.
I think in many (if not all or most) of these cases, the user's
password
has been compromised. This is especially likely if it's possible
to
configure a client insecurely (plain text password with no
TLS/SSL).
I've seen this happen on more than one occasion, on a small
domain.
Password sniffing does happen.
First step is to ensure that clients cannot attempt to
authenticate with
clear text passwords. This can be enforced with dovecot, but we
don't
have a way yet to enforce it on the sending/smtp side. I'm
hopeful that
Sam will get this feature built into spamdyke in the near
future.
Another good defensive weapon is a script I came across on the
spamdyke
list today, and hope to make available in some form with QTP in
the
future. It's a script that periodically checks the logs for
accounts
which have sent more messages in a given interval than some
allowed
limit. When it finds such an account, it changes the password,
removes
messages from that account still in the queue, and notifies the
postmaster with an email. I think this is very practical,
because
passwords do become compromised on occasion, even with full
encryption
(human action). The script is written in python, and will need a
little
tweaking for the QMT environment, as it's presently written to
scan a
spamdyke log (the author wasn't using the submission port at
all). I
think it'd be better to scan the send log if that's feasible.
Anywise, I
think this approach is promising.
If anyone has any thoughts on this, please chime in. It's in
everyone's
interest to be protecting our public IP addresses so they don't
get
blacklisted.
Thanks.
--
-Eric 'shubes'
On 05/21/2012 01:42 PM, fmende...@terra.com
wrote:
> Hello everyone
>
>
> I am the owner of a growing hosting enterprise in my
country (Perú), and
> we are facing big rise on our client number.
>
> As an efect of this we are seeying a rise in mail
outbound in our
> servers. Even thoug we put limits to hourly sending,
having more than 9k
> clients, all delivering through the same cluster, it
lacks of
> efectiveness because each server in cluster uses only one
ip for sending
> tasks. We are now seeying blocking issues because of the
many clents
> generated traffic.
>
> We talked to some people at godaddy and hostgator, as we
know they use a
> cluster system that includes on each server a list of IPs
that rotates
> in a random fashion, so even with high demand quality
service on mail
> delivery from client accounts is always achieved.
>
> I would like to ask for some guidance and help to this
comunity on how
> can we could implement such solution to rotate in a
random or other way
> the IPs for sending clients mails.
>
> I hope you people can see my situation and can help me
with this. We
> used to work with exim, but since we changed to QMT it
was the best
> desition we ever made on this matters. Now we need to
push it to a next
> level.
>
>
>
> Thanks a lot.
>
>
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