We had it last night, too, but this morning seeing it again for hotmail.com,
outlook.com, and live.com:

<redacted>@premieronline.net    <redacted>@hotmail.com  ubad=980379246, ()
Site (hotmail.com/2a01:111:f400:7ea9::33) said: 451 4.7.500 Server busy.
Please try again later from [2a01:111:e400:fc4a::4e]. (AS750)
[SN1NAM02FT0003.eop-nam02.prod.protection.outlook.com]

<redcated>@premieronline.net    <redacted>@outlook.com
ubad=980379246, () Site (outlook.com/2a01:111:f400:fe59::33) said: 451
4.7.500 Server busy. Please try again later from [2a01:111:e400:fc64::41].
(AS750) [DM6NAM12FT053.eop-nam12.prod.protection.outlook.com]

<redacted>@mypremieronline.com  <redacted>@live.com
ubad=980379246, () Site (live.com/2a01:111:f400:7d00::33) said: 451 4.7.500
Server busy. Please try again later from [2a01:111:e400:fc12::48]. (AS750)
[VI1EUR05FT046.eop-eur05.prod.protection.outlook.com]

They're all IPv6 hosts, though it's possibly our MTA prefers that when
communicating to Microsoft.

Frank

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