It was thus said that the Great Pete Turnbull once stated:
Can you cite any legitimate use for a completely
open relay? I can't
think of any. Lacking such examples, I agree with Scott G. Taylor's
statement:
> The simple fact-of-the-matter is, open relays are wrong.
My ISP runs two SMTP mail servers, one open, the other not; for a very good
reason. A large number of customers travel across Europe, and it is not
practical for them to always dial the ISP at international rates.
Hiway (a subsidiary of Verio and their primary web hosting division) set
up a system whereby you have to check your mail first before sending. They
have a modified POP server that records the IP address of the person
requesting their mail. Sendmail will then allow relaying from that IP
address for a period of time before being disallowed again.
Since most people check their email before sending, it's not that
inconvienent to use. Something similar could probably be set up.
-spc