Hello!
Friday, January 05, 2001, 6:26:39 AM, Thomas Fernandez <[EMAIL PROTECTED]> wrote:
>>>It doesn't matter what account you are using on TB, what matters is
>>>what CONNECTION you have. Choose whichever ISP is the most reliable
>>>for you to connect to, and then use that one for all SMTP. When you
>>>are logged on, it is not considered relaying. What is a problem if
>>>your connection is with ISP-1 and you try to send mail to the SMTP for
>>>ISP-2.
OR>> Well a ruling of the ISPA (www.ispa.be) (belgium organisation
OR>> regulating ISP's in belgium) stipulates that no SMTP server should
OR>> have an "open" line.
TF> It is not an "open" line if you are connected to it.
Hmm... Didn't catch the point, could you please explain? :-)
OR>> In short, ISP's are only allowed to give SMTP
OR>> access to users that reach them from withing their own dial-ins/leased
OR>> lines/DSL..., but not to someone connecting to it via some other
OR>> location on the internet.
TF> That's what Abigail is saying. For example, your From address is
TF> @gmx.be, but you are logged in through @abc.be, i.e. dial in through
TF> them. Then use the SMTP serever of abc.be. That's what I doing here:
TF> look at my From address and my SMTP server in the headers. I never use
TF> the GMX SMTP server; in fact I use the same local SMTP server for all
TF> my five accounts across three countries.
TF> Relaying would be if I used an SMTP server in Germany for an account
TF> in Thailand while having dialled in through an ISP in Taiwan. If I use
TF> the SMTP server of the ISP I dial in through, it is not relaying,
TF> never mind the From address.
Sorry, but you're wrong here.
Generally, all SMTP servers are "relays". But the actual server
behaviour can significantly vary. You can use ORBS, RBL, DRBL, RSS
whatever databases to prevent spammers from sending your their crap, you
of course should use some kind of ACL (access.db on sendmail) etc. It
depends, as we say here in Russia :-).
So we're speaking about so-called "third party relaying" in this thread.
This relaying occurs when someone connects to a SMTP server which is
serving some number of domains (the actual number doesn't matter here -
it can be 1, 2...) and use the the domain _names_ not known as "local"
by this server as an argument in the MAIL FROM: _and_ RCPT TO: commands.
Here is the example. Imagine that one of my SMTP servers acts as a relay
for the following domains:
- besta.aernet.ru
- schastya.net
- athome.net.ru
There will be no problems when sending messages to, from or across these
domains. But if a client connects to this server and says
EHLO hostname.client.net.ru
MAIL FROM:<[EMAIL PROTECTED]>
RCPT TO:<[EMAIL PROTECTED]>
then after the last command the server would reply
550 Relaying denied
because none of the domains used by this kiddie are "local" to the
server.
--
Yours sincerely,
Andrey G. Sergeev (AKA Andris) http://www.andris.msk.ru/
--
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