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Home > Archive > IIS and SMTP > August 2005 > SMTP gateway
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| Hi,
in order to be able to send an email, do I have to specify and SMTP gateway?
how would a server know that an email should be relayed to a specified
server? Thanks.
Frank
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| Jeff Cochran 2005-08-25, 2:53 am |
| On Sat, 20 Aug 2005 11:50:11 -0600, "Frank" <frank673@hotmail.com>
wrote:
>in order to be able to send an email, do I have to specify and SMTP gateway?
>how would a server know that an email should be relayed to a specified
>server? Thanks.
A SMTP "gateway" is just a SMTP server that accepts mail for a range
of IP addresse4s, there's nothing special about it. And yes, to send
mail you have to specify a SMTP server. As for how it knows where to
send it, that's magic. 
Okay, that's what DNS does, in conjunction with your SMTP server and
mail client. It's like the post office. How does the mailman know
what house to deliver to? Yep, the address on the message itself.
How does he know that he delivers to the Smith's house on Sesame
Street if there's no address? That's right, he looks up the address
somewhere.
Same thing only faster and electronic.
Jeff
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| "Jeff Cochran" <jeff.nospam@zina.com> wrote in message
news:4310449b.891847031@msnews.microsoft.com...
> On Sat, 20 Aug 2005 11:50:11 -0600, "Frank" <frank673@hotmail.com>
> wrote:
>
>
> A SMTP "gateway" is just a SMTP server that accepts mail for a range
> of IP addresse4s, there's nothing special about it. And yes, to send
> mail you have to specify a SMTP server. As for how it knows where to
> send it, that's magic.
>
> Okay, that's what DNS does, in conjunction with your SMTP server and
> mail client. It's like the post office. How does the mailman know
> what house to deliver to? Yep, the address on the message itself.
> How does he know that he delivers to the Smith's house on Sesame
> Street if there's no address? That's right, he looks up the address
> somewhere.
>
> Same thing only faster and electronic.
>
> Jeff
Thank you for the answer. If I understand it correctly, If I send an email
to an adress in lets say hotmail.com then it would lookup the server in the
DNS and send it directly. right? If not, and if I have to specify an SMTP
gateway then I should contact my internet provider to tell me what their
SMTP server is. Otherwise I would get the error message "550 Relaying
denied" that I am getting right now. Thanks.
Frank
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| Jeff Cochran 2005-08-30, 2:55 am |
| On Thu, 25 Aug 2005 08:29:41 -0600, "Frank" <frank673@hotmail.com>
wrote:
>"Jeff Cochran" <jeff.nospam@zina.com> wrote in message
>news:4310449b.891847031@msnews.microsoft.com...
>
>Thank you for the answer. If I understand it correctly, If I send an email
>to an adress in lets say hotmail.com then it would lookup the server in the
>DNS and send it directly. right? If not, and if I have to specify an SMTP
>gateway then I should contact my internet provider to tell me what their
>SMTP server is. Otherwise I would get the error message "550 Relaying
>denied" that I am getting right now. Thanks.
If you send a message to someone@hotmail.com, your SMTP server looks
up the DNS and sends it. Your mail client needs access to the SMTP
server though.
Jeff
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