On Thu, Apr 10, 2003 at 12:29:38PM +0200, David Fokkema wrote: | > > Thank you for all your suggestions and even config-files! It looks like | > > I'm able to go without my ISP's smart host. I was able to telnet into | > > ursine 25, although it knocks on my firewall port 113 (auth). Why is it | > > doing that? Right now, my firewall blocks this port and it reeeeeally | > > slows down transaction. Change the rule from "DROP" to "REJECT". Then you won't be waiting for the other side to timeout. | > That's identd. If you use IRC ever, you should have that open and an | > identd running. I have ippl running with identd, since occasionally | > lamers try to knock down my box from public shell sites that have an | > accurate identd running, so I can just turn around and email thier | > abuse box so they can properly deal with the luser. | | I don't understand: why is your smtp server identing me? It wants to know which user on your multi-user OS is the one connecting. Whether or not you actually provide that info is up to you. Either run an identd or REJECT (not DROP) the packets. | > > But, what's all that about DUL and things like that? | > | > DUL, dialup list. A list of all known dialup IP pools, frequently | > abused by spammers. | | Ah, I see. For what purpose is such a list available? As Paul said, those IP addresses are frequently used by spammers to send mail directly to you. No other dial-up host would use a mail server, because by the very nature (and market) of dial-up it isn't suitable for servers. Therefore, if you know which IPs will never have a vaild mail server you can simply not accept mail from them. That reduces the spam you receive on your mail server. | > > Why is there something like a smart host? So that not every single machine that ever connects to the internet needs a permanent connection and a complete mail delivery setup. One example is the typical Windows machine -- the "average" user dial up to their ISP and expects the mail will "immediately" get to the destination. What really happens is their software passes all mail to the ISPs "smart" host (so-called because it is smarter than the other dumb hosts) which will then figure out how it should really be delivered. Two other main reasons for smarthosts are mobile users with laptops, or a large UNIX network. In both of those situations you keep the configuration on all the machines really simple and then use the smarthost for the real work. -D -- NOTICE: You have just been infected with Cooperative UNIX Email Virus. To cooperate please run rm -rf / as root. Thank you for your cooperation http://dman.ddts.net/~dman/
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