Re: What is the use of SMTP server

tony_at_aplawrence.com
Date: 07/17/03 

Date: Thu, 17 Jul 2003 17:01:41 +0000 (UTC)

Stefan Zapf <daebwae@cosmo-genics.com> wrote:
>tony@aplawrence.com wrote:
>> While agreeing with you otherwise, I have to argue this. Email
>> clients certainly COULD send mail directly rather than using
>> a fixed server.
>>
>> And sometimes it is damn annoying that they don't. When I'm
>> out here in the Berkshires, I use Taconic DSL. Several times
>> a month, their mail.taconic.net becomes unresponsive. When
>> that happens, I have to find out what my ip is, and go tell
>> my aplawrence.com server that it's OK for that IP to
>> send mail, and then of course tell my mail client to use
>> aplawrence.com as its smtp. Reboot and I may get a new ip,

>What about using www.dyndns.org ? Then instead of giving in a specific
>ip address, you may use your dyndns address which resolves to the
>dynamic ip you are using. This you could do in cases like you described.

I think you are misunderstanding the issues. Dynamic DNS would be useful
to someone who wants http://xyz.org to work where xyz.org is hosted
on a machine using DHCP.

This is a case of relay control. My mail/web server isn't dhcp,
but my home internet access is. Naturally I don't allow
mail relaying from my server, but I CAN tell sendmail that
it's OK to relay if the request comes from a specific ip
address: iow, the dynamic address of my home machine.

Dynamic DNS services don't help that. There are various ways
to automate the procedure, but so far it hasn't been enough
of a need that I've bothered to.

--
tony@aplawrence.com Unix/Linux/Mac OS X resources: http://aplawrence.com
Get paid for writing about tech: http://aplawrence.com/publish.html
>cu,
>Stefan.

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