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 _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop