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.forward implies recipients must whitelist forwarding hosts

2003-10-06 16:11:40
On Mon, Oct 06, 2003 at 12:02:48PM -0700, Ted Cabeen wrote:
| 
| There's also scenario 3, where HP whitelists pobox.com, allowing this
| kind of forwarding from any IP that forward and back DNS verifies as a
| subdomain of pobox.com.  We could even create DNS-based whitelists
| that reject forwarded mail from a domain unless it shows up in such a
| whitelist.
| 

This is a good solution.  I will specify a Colander module that allows
users to perform whitelisting.

Colander is a pluggable SMTP proxy daemon with per-user filtering.  It
will form the basis of pobox's next round of spam filters.

| Quick note:  I think that SPF also breaks /etc/aliases mailing lists
| as well.  Are people who have simple lists like this also going to
| have to move to something larger with sender-address rewriting?
| 

yes, they should use a real MLM.

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