That is intentional/by design. The source is inside 40.95.0.0/16 which is their "relay pool". It is documented here - https://docs.microsoft.com/microsoft-365/security/office-365-security/high-risk-delivery-pool-for-outbound-messages. Scroll down to the relay pool subheader and read up more about it.
Hope this helps. On 1/20/2022 at 11:32 AM, "Klaus Ethgen via mailop" <mailop@mailop.org> wrote: > >Hi, > >since several weeks I see more and more SPF-Errors for mails >coming from >O365. It seems that when mails gets relayed, they use outbound mail >servers that are not valid for sending from the (relaying, not >origin) >mail address. > >My O365 account where I have relaying active is an academic >account. > >The last failure comes from IP 40.95.92.45 and is trying to deliver >mails from klaus_eth...@stud.phzh.ch (my academic account). > > > spfquery -ip 40.95.92.45 -sender klaus_eth...@stud.phzh.ch > fail > Please see >http://www.openspf.org/Why?id=klaus_ethgen%40stud.phzh.ch&ip=40.95. >92.45&receiver=spfquery : Reason: mechanism > spfquery: domain of stud.phzh.ch does not designate 40.95.92.45 >as permitted sender > Received-SPF: fail (spfquery: domain of stud.phzh.ch does not >designate 40.95.92.45 as permitted sender) client-ip=40.95.92.45; >envelope-from=klaus_eth...@stud.phzh.ch; > >It is pretty impudent from microsoft to write in the deliver >failure: > It's likely that only the recipient's email admin can fix the > problem. Unfortunately, it's unlikely Office 365 Support will >be able > to help with these kinds of externally reported errors. > >No, it IS solely the fault of Microsoft not be able to manage SMTP >correctly. > >Any ways to get them to correct their SMTP setup? > >Regards > Klaus > >Ps. Could it be, that http://www.openspf.org/Why is broken? I get > connection refused. >-- >Klaus Ethgen >http://www.ethgen.ch/ >pub 4096R/4E20AF1C 2011-05-16 Klaus Ethgen ><kl...@ethgen.ch> >Fingerprint: 85D4 CA42 952C 949B 1753 62B3 79D0 B06F 4E20 AF1C _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
