Hi, We've been seeing random '554 Transaction failed' replies from Live.com. Some started at the 9th. But around 2016-01-10 10:15:09+0100 we had a whole batch. But not more than around 1:100 mails get hosed.
Do others see the same? What could the cause be? Met vriendelijke groet, David Hofstee Deliverability Management MailPlus B.V. Netherlands (ESP) P.S. Needless to say: I have SNDS, IPs are 'green', <0.1% complaints, JMRP normal for these mailings, ...
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