nanog mailing list archives
Re: Mailing list SPF Failure
From: William Herrin <bill () herrin us>
Date: Thu, 16 May 2024 15:54:33 -0700
On Thu, May 16, 2024 at 12:03 PM John Levine <johnl () iecc com> wrote:
It appears that Michael Thomas <mike () mtcc com> said:Since probably 99% of the mail from NANOG is through this list, it hardly matters since SPF will always fail.Sorry, but no. A mailing list puts its own envelope return address on the message so with a reasonable SPF record, SPF will normally succeed.
Exactly. SPF acts on the -envelope- sender. That means the one presented in the SMTP From:<> command. For mail from nanog, that's: nanog-bounces+address () nanog org, regardless of what the sender's header From address is. The message content (including the message headers) is theoretically not used for SPF validation. In practice, some SPF validators don't have direct access to the SMTP session so they rely on the SMTP session placing the envelope sender in the Return-path header. Regards, Bill Herrin -- William Herrin bill () herrin us https://bill.herrin.us/
Current thread:
- Mailing list SPF Failure Scott Q. (May 15)
- Re: Mailing list SPF Failure Mel Beckman (May 15)
- Re: Mailing list SPF Failure Bjørn Mork (May 15)
- Re: Mailing list SPF Failure Peter Potvin via NANOG (May 16)
- Re: Mailing list SPF Failure Michael Thomas (May 16)
- Re: Mailing list SPF Failure Scott Q. (May 16)
- Re: Mailing list SPF Failure Michael Thomas (May 16)
- Re: Mailing list SPF Failure John Levine (May 16)
- Re: Mailing list SPF Failure William Herrin (May 16)
- Re: Mailing list SPF Failure John R. Levine (May 16)
- Re: Mailing list SPF Failure Scott Q. (May 16)
- Re: Mailing list SPF Failure John R. Levine (May 16)
- Re: Mailing list SPF Failure Michael Thomas (May 16)
- Re: Mailing list SPF Failure Tom Beecher (May 16)
- Re: Mailing list SPF Failure Peter Potvin via NANOG (May 16)
- Re: Mailing list SPF Failure Tom Beecher (May 16)
- Re: Mailing list SPF Failure Michael Thomas (May 16)
- Re: Mailing list SPF Failure Scott Q. (May 16)
- Re: Mailing list SPF Failure Michael Thomas (May 16)
- Re: Mailing list SPF Failure Karl Auer (May 16)