On September 9, 2001 04:26 pm, Adrian Ho wrote:
> On Mon, Sep 10, 2001 at 08:01:15AM +1000, Charles Widdis wrote:
> > Obviously Open Relay is very bad.. but I have clients sending/receiving
> > mail from all over the place via many varied ISPs.
>
> Most ISPs provide their users with SMTP relays (some even configure them
> correctly as non-open relays 8-). Is there a reason why those can't be
> used in your situation?
>
> Also check out Chris Johnson's "The qmail newbie's guide to relaying" @
> <http://www.qmail.org/>.
Some ISPs not only block SMTP based on IP, but also based on sender's
address. Therefore, when domain-email-hosted customers try to send through
their ISP's relay, it will not accept the mail. The whole concept of hosting
domains and email when you are not an ISP is quite difficult to manage when
considering problems like mail relaying.
-Eric
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