Investigating, but seeing this traffic. Is there any clustering by datacenter? That would be the first 3 characters of the hostname....
Aloha, Michael. -- Sent from my Windows Phone ________________________________ From: Kirk MacDonald<mailto:kirk.macdon...@corp.eastlink.ca> Sent: 6/30/2016 8:11 AM To: mailop@mailop.org<mailto:mailop@mailop.org> Subject: [mailop] Failures to .mail.protection.outlook.com Wondering if others are seeing mail queue up within the last hour to domains hosted at protection.outlook.com… or if it’s just me? The most frequent behaviour is an immediate hangup during ehlo. Also seeing a small number of successful deliveries and 4xx resposes: 4.3.2 The maximum number of concurrent server connections has exceeded a per-source limit, closing transmission channel (BL2FFO11FD020.protection.gbl) That’s suggests that there are some systems behind the MX that are answering and are probably getting stressed. Our IPs in SNDS are “green”, but I am not always clear about where Outlook/Live/Hotmail stops and protection.outlook.com begins. Kirk MacDonald System Administrator Internet Eastlink
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