On Mon, 14 Oct 2024 at 11:20, Benoit Panizzon via mailop <mailop@mailop.org> wrote:
> 550 5.7.1 Unfortunately, messages from [157.161.12.69] weren't sent. > Please > contact your Internet service provider since part of their network is > on our > block list (S3150). You can also refer your provider to > http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol > Filter Agent][AGT=PFA][MxId=11B9D54E88BF532F] [...] > Has anyone a clue, what might be the cause and how to resolve? > Can't help with the cause, I doubt Microsoft actually know them ;-) , but I found that I have to stop sending to microsoft using the IP for at least 24 hour, otherwise the block doesn't go away. In my case before I get the S3150 (perm error) I always get some S775 (temp error): I stop sending for 1 hour every time I see an S775 and this made the S3150 to almost disappear. I desperately tried to find the cause opening ticket to Microsoft many times in the past years, but you know you only get templated answers even when you are able to escalate the ticket. At most you get a mitigation but no one need a mitigation as if they don't know what caused the issue then it will apear again over and over again. Also I saw those errors are not related to SNDS IP color nor to JMRP reports: you can get that block for green IPs and have red IPs sending without issues. I'm not even convinced the green/red are related to the spam folder ratio. Stefano -- Stefano Bagnara Apache James/jDKIM/jSPF VOXmail/Mosaico.io/VoidLabs
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