Hi Michael, S3150 and S3140 are both volume (emails per hour) throttling. >
I understand that obviously you want to keep the details to yourself, but could I ask for some advice on how to avoid constantly being blocked by these (we don't seem to face S3140 since around 2020, but we see a lot of S3150 as I mentioned). We're a Managed VPS provider, meaning that it's very rare for any of our servers to be spamming (our customers do not have root access, so they are far less attractive for spammers than the typical $5 server abuse magnets!) - but a cross section of our customers are repeatedly caught by S3150 bounces. Is it because they're changing their email volumes (likely to be very low) too dramatically from day or hour to the next, or is it this analysed in aggregate (e.g. per /24 or similar)? To my knowledge, none of the emails blocked by this are spam or likely to be reported as such by the recipients - so what I'm asking here is how can we improve deliverability of these S3150-blocked emails that your users actually want to receive? If there are changes we can make, or that our customers can make, I'm eager to hear! Thanks, Damien -- <https://www.layershift.com> Registered office: Layershift Limited, 83 Ducie Street, Manchester, M1 2JQ, United Kingdom Layershift Limited is a company registered in England and Wales (6036217).
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