-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
David Woodhouse wrote:
Any mail system of more than negligible size will have its users
forwarding mail from a large and uncontrolled pool of forwarders. The
admin would have to force its users to either keep track of those
forwarders for it, or risk losing their mail.
Keeping track of forwarders is a hard problem even when it's limited to
a few users and a few forwarding domains. The user would be expected to
know the IP addresses which may be used for _outgoing_ mail by each of
the mail hosts which is part of the forwarding domain, and would be
expected to monitor that list and maintain it constantly.
This is not exactly true. Such detection can be done automatically,
provided that forwarders and whitelisters use a commonly agreed upon
protocol. (Look at how SpamCop implemented their "mailhosts" feature.)
I agree that such a protocol does not yet exist, but it would be simple and
it has been on my TODO list for about a year now. Need. More. Time.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)
iD8DBQFCysWOwL7PKlBZWjsRAhCuAKCimwuqQCMFVHMRI1/vf/RirB6NGQCfcsKH
wzkA1DNLwTmw5yi6R93/ZRg=
=yCJT
-----END PGP SIGNATURE-----