Did you check the the RCPT Commands and Data Commands? Seems like a reputation throttle
On Thu, Oct 8, 2020 at 10:06 PM Mark Fletcher via mailop <mailop@mailop.org> wrote: > Hi All, > > I'm bringing up a new mail server for groups.io, 66.175.222.108. I've > been slowly sending email through it for the past two weeks or so. But it's > being throttled by Outlook (sample: 451 4.7.500 Server busy. Please try > again later from [66.175.222.108]. (S77719) [ > DM3NAM05FT012.eop-nam05.prod.protection.outlook.com]). > > I've registered the IP address with JMRP, although after 24 hours it still > says the feed is not active. Is there anything else I need to do? > > Thanks, > Mark > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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