Thanks for the heads-up on this.  I see you've already updated your 
SPF records so you'll be fine for sending to all of our servers:

                OpenSPF :: Analyze :: ietf.org
                https://www.openspf.ca/tools/analyze-spf.perl?z=ietf.org

        Your IP address, 166.84.6.31, looks clean:

                https://multirbl.valli.org/lookup/166.84.6.31.html

        You might want to check into the history of 166.84.7.34 as it's part 
of a "superblock" blacklist:

                https://multirbl.valli.org/lookup/166.84.7.34.html

        We don't use that DNSBL for blocking, but it might lead to eMails 
landing in "spam/junk" folders on systems that give it weight.

        Both IP addresses are inclued in multiple whitelists, so I don't 
expect that you'll encounter any serious problems.

> Hi all,
> 
> just a heads up that the IETF will be adding a new host sending outbound 
> mail, relay01.ietf.org (166.84.7.34), over the next couple days. This will 
> cover domains ietf.org, iab.org, irtf.org, rfc-editor.org, i1b.org, iesg.org, 
> forwarder.ietf.org and zulip.ietf.org.
> 
> All mail for the above domains will now come from one of two hosts:
> 166.84.7.34 relay01.ietf.org
> 166.84.6.31 mail2.ietf.org
> 
> 
> If you could adjust whitelists and other filters appropriately, shout out if 
> you have any concerns or questions
> Cheers,
> 
> Dane
> _______________________________________________
> mailop mailing list
> [email protected]
> https://list.mailop.org/listinfo/mailop


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