Re: [swinog] Re: blocking ports?

[Peter Bickel]

Scott Weeks schrieb:

Hello,



This is what I was saying to the guys here at my work.  We just need a small 
proof that the customer isn't a spammer and we open it up.  However, most of 
our customers are less-technical savy home folks.  Did you have to prove to 
your ISP that you weren't spamming?  If so, how did they have you do that?

: So if a customer proofs that he is able from a technical : Point of view to operate an mail server in a secure manner : and assures not to abuse email for spam then it's not : acceptable that an ISP block anything to him.

I was a test user as cablecom startet with highspeed internet. At the
beginning of cablecoms start as ISP before they bought Swissonline I was
in regular technical contact with both Swissonline and also Cablecom as
a Sun Microsystems Systems Engineer, so they already had the impression
that I was knowing something about TCP/IP sendmail and so on.

In other words they really had never tried to ask, because normaly
I told them how to fix things ;-)

Other ISPs like TIC former Via Networks aka KPNquest /EUnet, Init 7,
Netstream, Cybernet etc I had technical contact with I woul say they would
not ask if I am able to setup things the right way.

BTW: I'm a real SPAM hater and therefore I would be interested in a legal

and Co. if I get SPAM from them now that the LAW changed in Switzerland. ;-)

session in our next SWINOG meeting to see if I can earn money from Socken SPAM

Thanks,
scott


--- [EMAIL PROTECTED] wrote:

From: Peter Bickel <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Re: [swinog] Re: blocking ports?
Date: Thu, 12 Apr 2007 12:03:28 +0200

Scott Weeks schrieb:

I'm speaking with guys in my company on an issue and part of the discussion has 
to do with me saying no one runs a mail server from behind a dynamic IP 
addresses.  Other than just your experiences, does anyone have pointers to data 
on folks that do this?

scott

: You'd be amazed how many companies operate their own : mail servers, even behind dynamic addresses

Hi Scott


which have of corse fixed IP addresses which we use to relay to the outside.
All hosts use Solaris and sendmail and are protected with IPFilter with very
restrictive Rules. Incomming email is going through the external hosts and
an IPIP Tunnel directly to the internal mail server.

We really don't want to be dependend on an ISPs email SETUP. DNS is the
same which helped me in the past a lot where several customers weren't able
to use the net everything worked for us. So if a customer proofs that he
is able from a technical Point of view to operate an mail server in a

that an ISP block anything to him.

we do exactly this for IDV & Network Consulting. We operate our own Mailserver (Solaris with sendmail and iamp) in our internal Network which is connected to Cablecom (DHCP ;-)) In addition we have some Maschines in a hosting environment secure manner and assures not to abuse email for spam then it's not acceptable

--- [EMAIL PROTECTED] wrote:

From: Markus Wild <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: [swinog] Re: blocking ports?
Date: Wed, 11 Apr 2007 19:26:39 +0200

Jonathan,

Sorry but I disagree with Per.  ISPs have a duty to prevent email
Spam which is a terrible curse for us all.  If they decide that
blocking port 25 outbound will help then they should do it.

If you are a user, why can't you use the ISPs relay server? If you
are a provider you ought to have your own mail server on a fixed IP
address.

You'd be amazed how many companies operate their own mail servers, even
behind dynamic addresses (in which case they usually use some mailbox
polling mechanism to feed their server from mail from the outside), but
send outgoing mail directly with SMTP.

Of course, one day we need a better protocol than SMTP (*Simple* Mail Transfer Protocol) which was never meant as a global email solution. But until then we have to do something to stop people abusing it.

But by killing the payload, not the messenger, please...

Cheers,
Markus
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Gruss
       Pitsch

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Peter Bickel                            e-mail:  [EMAIL PROTECTED]
IDV & Network Consulting                Telefon: +41  1 853 24 16
Gumpenwiesenstrasse 38                  Fax:     +41  1 853 27 04
CH-8157 Dielsdorf                       Mobile:  +41 79 666 15 50

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