Hmm.,… Let me ask all my 1500 clients to send one email address per day only!!
That should keep me in business, right?? -- Mohit Godiya President, Computerisms [email protected]<mailto:[email protected]> From: mailop <[email protected]> On Behalf Of Michael Brown via mailop Sent: February 20, 2026 8:41 PM To: [email protected] Subject: Re: [mailop] [EXTERNAL] Anyone from Outlook? S3150 block list mirage On 2026-02-20 17:01, Michael Wise via mailop wrote: It’s throttling. Slow down your deliveries. S3150 is what you get when you don't slow down after seeing 4xx. 😊 (I've just now (well, reading all the recent messages) seen Michael has a Microsoft email address). Assuming this information is100% accurate, how exactly is this advice supposed to be acted upon in a practical manner? The advice to slow down delivery seems only appropriate to a bulk email sender, especially for companies who send out hundreds of thousands or millions of emails for a campaign. A campaigner's job is to get those queued mails delivered as fast as possible and their systems are going to be tailed for this specific job, so they *might* actually be watching for 4xx messages to tune their delivery rate. For *everybody else on the planet*, this is an unreasonable expectation. Slow down? This isn't a fixed-size delivery, this is a bucket that never empties. In our case the email we are sending out is *transactional*; signups, password resets, activity notifications. We're fielding daily complaints from people trying to sign up for for sites that we host and not receiving confirmation emails. The frustration I experience myself and see in others is no doubt borne out of Microsoft's unwillingness to engage or act in a way that is, from an outside view, sensible and reasonable. We're also left holding the bag when people complain, because if Microsoft blocks our IPs its obviously our fault, right? I refuse to accept that, nor should others. Michael -- Michael Brown Civilized Discourse Construction Kit, Inc. https://www.discourse.org/
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