nanog mailing list archives
Re: why IPv6 isn't ready for prime time, SMTP edition
From: Rob McEwen <rob () invaluement com>
Date: Tue, 25 Mar 2014 22:51:11 -0400
On 3/25/2014 10:25 PM, Brielle Bruns wrote:
Like I said in a previous response, if you are going to make rdns a requirement, why not make SPF and DKIM mandatory as well?
many ISPs ALREADY require rDNS. So making that standard official for IPv6 is isn't asking for much! It is a NATURAL progression. As I mentioned in a previous message, i think IPv6 should go farther and require FCrDNS, with the host name ending with the sender's actual real domain so that proper identity is conveyed. (then when a spammer uses a "throwaway domain" or known spammy domain... as the domain at the end of the rDNS, they have only themselves to blame when the message is rejected!) SPF is somewhat "dead"... because it breaks e-mail forwarding situations. Anyone who blocks on a bad SFP is going to have significant FPs. And by the time you've dialed down the importance of SPF to prevent FPs (either by the receiver not making too big of a deal about ir, or the sender using a NOT strict SFP), it then becomes impotent. About the only good usage of SPF is to change a domain's record to "strict" in situations where some e-mail on that domain is being "picked on" by a "joe job" where their address is forged into MANY spams over a period of time. (not just the occasional hit that everyone gets). otherwise, SPF is worthless. Maybe we should require DKIM for IPv6, too? But what I suggested about FCrDNS seems like a 1st step to me. -- Rob McEwen +1 (478) 475-9032
Current thread:
- Re: why IPv6 isn't ready for prime time, SMTP edition, (continued)
- Re: why IPv6 isn't ready for prime time, SMTP edition John R. Levine (Mar 27)
- Re: why IPv6 isn't ready for prime time, SMTP edition Måns Nilsson (Mar 29)
- Re: why IPv6 isn't ready for prime time, SMTP edition Patrick W. Gilmore (Mar 29)
- Re: why IPv6 isn't ready for prime time, SMTP edition Måns Nilsson (Mar 30)
- Re: why IPv6 isn't ready for prime time, SMTP edition Patrick W. Gilmore (Mar 30)
- Re: why IPv6 isn't ready for prime time, SMTP edition Måns Nilsson (Mar 31)
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- Re: why IPv6 isn't ready for prime time, SMTP edition Larry Sheldon (Mar 30)
- Re: why IPv6 isn't ready for prime time, SMTP edition Brielle Bruns (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition TJ (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Brielle Bruns (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Rob McEwen (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Valdis . Kletnieks (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Laszlo Hanyecz (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Robert L Mathews (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Paul Ferguson (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Brielle Bruns (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Brielle Bruns (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Rob McEwen (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition John Levine (Mar 25)
- Re: why IPv6 isn't ready for prime time, SMTP edition Rich Kulawiec (Mar 26)
- RE: why IPv6 isn't ready for prime time, SMTP edition MailPlus| David Hofstee (Mar 26)