Thanks for your reply Jarland, I have been contacted privately. The procedure you described is the one we always follow but this time it’s been different and all of the requests have been denied at all levels for a couple of weeks. This morning I see that a few IP addresses have been mitigated, unfortunately not the most critical ones, but at least this is a sign that we can hope for an improvement.
Thanks for taking time in getting back to me. Rodolfo Da: mailop <[email protected]> per conto di Jarland Donnell via mailop <[email protected]> Data: lunedì, 14 novembre 2022, 19:44 A: [email protected] <[email protected]> Oggetto: Re: [mailop] Can't deliver to Microsoft from a subnet Just to be sure because I didn't see you mention it, make sure you've contacted them via the form I often see linked so many different ways but I'll link as this: https://urlsand.esvalabs.com/?u=https%3A%2F%2Fsupport.microsoft.com%2Fen-us%2Fgetsupport%3Foaspworkflow%3Dstart_1.0.0.0%26wfname%3Dcapsub%26productkey%3Dedfsmsbl3%26locale%3Den-us%26ccsid%3D636165504238569370&e=20266bc5&h=82b5d945&f=y&p=y Make sure to request that the IPs be put into temporary mitigation as you're warming up a new IP range. When they tell you that can't be done, reply and ask for it again, as many times as is necessary. It's just the way the dance is done, I've always been told. Certainly, it would be faster for one of our friends here on this list to help you if they can, but it's been a few hours since you sent this and I at least have information that is more helpful than silence. So I hope it helps some. On 2022-11-14 03:13, Rodolfo Saccani via mailop wrote: > If anybody from Microsoft con help on this, my gratitude will be huge. > > > Some companies (like Southeastern railways, for example) are currently > unable to deliver their legit email traffic to Microsoft customers. > > We are an email security vendor operating worldwide, we develop and > sell email security virtual appliances and we also operate thousands > of those in our cloud for the customers that choose so. > > In London we had to rush to move customers out of UKCLOUD because the > company went into liquidation ( > > https://urlsand.esvalabs.com/?u=https%3A%2F%2Fukcloud.com%2Fhub%2Fnews%2Fliquidation%2F&e=20266bc5&h=fc4d64b7&f=y&p=y > ). UKCLOUD used to host > assets of government bodies, it has been branded as “the UK > sovereign cloud” and for this reason many of our UK customers wanted > to be hosted there. > > Because of the liquidation, service continuity is not guaranteed > anymore. We have quickly moved all of the customers to another DC in > London and for such customers we used a new IPv4 /24 that we had > recently acquired (194.39.109.0/24). > > We usually don’t have problems in ramping up the reputation of a new > subnet, all of our outbound email traffic is scanned and clean, every > customer has it’s own IP address(es) and we do not accept marketing > customers. > > This time it’s been different. The spike in email traffic from about > 100 IP addresses belonging to this new subnet is probably seen as > suspicious. These IP addresses are currently heavily rate-limited > despite us having followed the usual procedure through escalations > with Microsoft support. > > Some of these customers (public service operators and major colleges, > for example) have a significant outbound email flow being scanned and > delivered from these IP addresses, well above the current limits > allowed by Microsoft and we are forced to route some of the traffic > through relays with a good reputation. This is an emergency procedure > for us because it mixes outbound traffic of different customers > through shared IP addresses, which is something that we don’t do > except in critical situations like this. > > Rate-limiting is usually temporary and the limits increase in a > reasonable time but this time it looks like it’s not happening. I am > worried that we might have ended up in a corner, for this reason I > decided to write here, something I’ve never done in many years. > > Thanks to whoever will be able to help or provide suggestions. > > Rodolfo > > -- > > Rodolfo Saccani | CTO > > Email: [email protected] | Phone: +3903411880307 [1] > > > > Links: > ------ > [1] tel:+3903411880307 > _______________________________________________ > mailop mailing list > [email protected] > > https://urlsand.esvalabs.com/?u=https%3A%2F%2Flist.mailop.org%2Flistinfo%2Fmailop&e=20266bc5&h=8e9e62e0&f=y&p=y _______________________________________________ mailop mailing list [email protected] https://urlsand.esvalabs.com/?u=https%3A%2F%2Flist.mailop.org%2Flistinfo%2Fmailop&e=20266bc5&h=8e9e62e0&f=y&p=y -- This message has been checked by Libraesva ESG and is found to be clean. Follow this link to mark it as spam: https://mail2.libraesva.com/action/21838E0023.AF105/learn-spam Follow this link to blacklist sender: https://mail2.libraesva.com/action/21838E0023.AF105/blacklist
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