[REBOL] Re: Sending e-mail using non-default server
From: tim:johnsons-web at: 18-Nov-2001 16:20
On Sun, Nov 18, 2001 at 03:29:26PM -0800, [holger--rebol--com] wrote:
> On Mon, Nov 19, 2001 at 09:47:42AM +1100, Greg Schwarz wrote:
> > Jon,
> > One big problem you will have, many ISP's will not let you relay mail via
> > different smtp server. This is to stop spam mailers. Most ISP's you dial
> > into will only allow you to use their smtp server.
> Usually it is the other way around. The ISP you dial into does
> not care which SMTP server you use, but the SMTP server you connect
> to will only accept your email if it either recognizes you as a valid
> sender from the same domain as the server, or if the server is
> responsible for accepting email to the recipient of your email.
I stand corrected. As always, I'm learning a lot from Holger. :>)
> What this means is that you can usually either use the SMTP server of
> your ISP or the SMTP server the email eventually has to be sent to (as
> determined by DNS-MX), but not any other, arbitrary SMTP server.
> For ISPs to physically block outgoing SMTP traffic to non-local SMTP
> servers is relatively rare, because it breaks a lot of default Unix
> setups that run sendmail without a "smarterhost" entry. A lot of
> ISPs actually prefer you to run sendmail without "smarterhost", i.e.
> to connect directly to the destination SMTP server instead of going
> through the ISP's server, because this reduces the load on the ISP's
> server, in particular if you run and expand mailing lists.
> Holger Kruse
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Tim Johnson <[tim--johnsons-web--com]>