Gmail (thus Nanog) rejecting ipv6 email

Sun Apr 3 01:42:34 UTC 2022

On 4/2/22 6:21 PM, John Levine wrote:
> It appears that Michael Thomas <mike at mtcc.com> said:
>>> Google at least adds ARC headers in Gmail, and did the editing of RFC8617.
>> ARC resolves into a previously unsolved problem: reputation. ...
> No, actually it doesn't, as has been repeatedly explained.
>
> ARC addreses the problem that mailing lists do a lousy job of spam
> filtering, A list that usually sends lovely clean mail sometimes
> doesn't, since a typical list forwards anything with a subscriber's
> address on the From line including spam from cleverish spammers who
> take pairs of from/to addresses from stolen mailboxes.
>
> ARC lets the recipient system look back and do what we might call
> retroactive filtering, using info about messages as they arrived at
> the previous forwarder. While it would be nice if lists did a better
> job of spam filtering, they don't, and ARC is a reasonable remedy for
> that.

I'll be eager to see the papers substantiating this. Until then I remain 
completely skeptical. It's an experimental RFC for a reason. Let's see 
the data.

I'd also like to see a paper substantiating your claim that mailing 
lists do a bad job of spam filtering. In my experience it is a non-problem.

Mike