I have a reply from one of our Hotmail experts: “Outlook.com is changing the frontdoor infra to leverages Office365 (EOP), and part of the roll-out the mx record for Hotmail.co.uk was updated gradually over the past month. We saw mostly spammers still holding on legacy IPs when sending to this userbase and now the legacy infra won’t accept traffic for Hotmail.co.uk. In the coming weeks MX records for all outlook*/Hotmail* will change gradually (e.g. take a look at live.com and msn.com). All static/cached records will need to be updated.
Please let me know asap if you have situations that demand that we revert yesterday’s change and still allow Hotmail.co.uk on the old infra for few more days. Right now the error code for Hotmail.co.uk is the same as for other domains that legacy did not support, e.g. [email protected]” -David -----Original Message----- From: mailop [mailto:[email protected]] On Behalf Of Ken O'Driscoll Sent: Friday, September 1, 2017 8:31 AM To: [email protected] Subject: Re: [mailop] hotmail.co.uk bouncing entire IP range with "mailbox unavailable" On Fri, 2017-09-01 at 09:18 -0500, Alexander Burch wrote: > Anyone else seeing issue with hotmail.co.uk bouncing messages with > this > code: > > "550 Requested action not taken: mailbox unavailable," > > That's usually reserved for invalid email addresses, but they are > bouncing 100% of the messages we send them on on of our IP ranges with > that code. Just started this morning. For what it's worth, I had an affected client who has a good relationship with their list do individual tests and they get through, into the inbox. Same for individual emails from Gmail etc. Looks like it might only affect bulk mail. Ken. _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
