Alternately, cloud providers could block port 25 outbound by default, requiring new instances/owners to perform some action to be allowed to use port 25. Some VPN and Tunnel providers do that now. Really depends where you want to place the burden.
I feel like I've seen an RBL operator or two including categorizations for Cloud IP space to help MBPs have more information to make decisions. -- Alex Brotman Sr. Engineer, Anti-Abuse & Messaging Policy Comcast > -----Original Message----- > From: mailop <mailop-boun...@mailop.org> On Behalf Of Jaroslaw Rafa via > mailop > Sent: Thursday, August 27, 2020 6:22 AM > To: mailop@mailop.org > Subject: [EXTERNAL] Re: [mailop] Deutsche Telekom rejects connections > because of missing "provider identification" > > Dnia 27.08.2020 o godz. 09:21:20 Felix Zielcke via mailop pisze: > > Deutsche Telekom uses a whitelist which IPs can send mails to @t- > > online.de accounts. They block every IP by default. > > > > So if you got some cloud vm with a new IP address, which never before > > sent mail to a @t-online.de address, mails will be rejected. > > You need to write their postmasters so it gets added to their > > whitelist. And for this process you need to have a small web page with > > your personal address listed if your server is run privately. > > This is so absurd that it's even hard to find words to describe it. > > And it should be - in my opinion - a reason for everyone to block all e-mails > FROM t-online.de in return. > Maybe such an Internet-wide block will force them to change their absurd > policy. > -- > Regards, > Jaroslaw Rafa > r...@rafa.eu.org > -- > "In a million years, when kids go to school, they're gonna know: once there > was > a Hushpuppy, and she lived with her daddy in the Bathtub." > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://urldefense.com/v3/__https://chilli.nosignal.org/cgi- > bin/mailman/listinfo/mailop__;!!CQl3mcHX2A!S23BuDfgTodTdXo2GL- > 8xu8au4MQTZDTyeB_NmTJzyYL_53JNHhSlBO7HOAG4raq_5Nm$ _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
