nanog mailing list archives
Re: IPv6 mail The Reg does 240/4
From: "John Levine" <johnl () iecc com>
Date: 17 Feb 2024 17:21:32 -0500
It appears that Michael Thomas <mike () mtcc com> said:
I kind of get the impression that once you get to aggregates at the domain level like DKIM or SPF, addresses as a reputation vehicle don't much figure into decision making.
It definitely does, since there are plenty of IPs that send only malicious mail, or that shouldn't be sending mail at all. Every large mail system uses Spamhaus' IP lists as part of their filtering process. I hear that SPF is largely useless these days because most SPF records include IP ranges for many mail providers, and a lot of those providers do a poor job of keeping one customer from spoofing mail from another. DKIM is still quite useful. K. But what happens under the hood at
major mailbox providers is maddeningly opaque so who really knows? It would be nice if MAAWG published a best practices or something like that to outline what is actually happening in live deployments.
Unfortunately, spammers can read just as well as we can so it's not going to happen. R's, John
Current thread:
- Re: mail and IPv6, not The Reg does 240/4, (continued)
- Re: mail and IPv6, not The Reg does 240/4 John Levine (Feb 14)
- Re: The Reg does 240/4 Mark Andrews (Feb 14)
- Re: The Reg does 240/4 Lyndon Nerenberg (VE7TFX/VE6BBM) (Feb 15)
- Re: The Reg does 240/4 Owen DeLong via NANOG (Feb 15)
- Re: mail and IPv6, not The Reg does 240/4 Tim Howe (Feb 15)
- Re: The Reg does 240/4 Mike Hammett (Feb 16)
- RE: The Reg does 240/4 Brotman, Alex via NANOG (Feb 16)
- Re: The Reg does 240/4 John Levine (Feb 16)
- Re: The Reg does 240/4 Owen DeLong via NANOG (Feb 17)
- Re: The Reg does 240/4 Michael Thomas (Feb 17)
- Re: IPv6 mail The Reg does 240/4 John Levine (Feb 17)
- Re: IPv6 mail The Reg does 240/4 Michael Thomas (Feb 17)
- Re: The Reg does 240/4 Tom Beecher (Feb 14)
- Re: The Reg does 240/4 Owen DeLong via NANOG (Feb 15)
- Re: The Reg does 240/4 Christopher Hawker (Feb 15)
- Re: The Reg does 240/4 Owen DeLong via NANOG (Feb 15)
- Re: The Reg does 240/4 Lyndon Nerenberg (VE7TFX/VE6BBM) (Feb 15)
- Re: The Reg does 240/4 William Herrin (Feb 15)
- Re: The Reg does 240/4 Owen DeLong via NANOG (Feb 15)
- Re: The Reg does 240/4 Brian Knight via NANOG (Feb 15)
- Re: The Reg does 240/4 Tom Beecher (Feb 15)