Hello there, We are seeing a huge spike in "550 5.7.1 Unfortunately, messages from [ IP.AD.DR.ES] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140)" errors while sending to Hotmail/Outlook. It started on Sep 7th and is affecting only one datacenter, the rest is sending the same emails just fine. The SNDS shows the affected IPs as green. Filed a ticket (SR1508383241) but curious to see if it's widespread.
Thanks in advance, Rauf
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