Sorry sent it before I was done: RCPT commands This is the number of RCPT commands sent by the IP during the time period in question. RCPT commands are part of the SMTP protocol <http://www.ietf.org/rfc/rfc2821.txt> used to send mail, specifically that which specifies one's intent to send mail to the provided recipient. That is, the command "RCPT TO:<exam...@hotmail.com>" requests Outlook.com's servers to respond with whether it will accept mail for exam...@hotmail.com, information which is invaluable to spammers trying to compile recipient lists for future spamming. For reference, more than a third of IPs sending mail to Outlook.com keep the fraction of RCPT commands that don't result in message recipients under 10% and that is a good benchmark to measure against.
DATA commands The number of DATA commands sent by the IP during the activity period. DATA commands are part of the SMTP protocol <http://www.ietf.org/rfc/rfc2821.txt> used to send mail, specifically that part which actually transmits the message to the previously established intended recipient(s). Message recipients This is the number of recipients on messages actually transmitted by the IP. With well-behaved mailers, there is often a small difference (a few percent) between the number of RCPT commands and this number, due to accounts becoming inactive and other such anomalies. A large discrepancy however can indicate problems with the sender, such as out of date recipient lists or namespace mining, both of which are commonly associated with spamming. Please note that if you find this number is larger than the reported number of RCPT commands by a small amount, it is most likely due to a specific and well-understood anomaly in our systems which record this data and should be no cause for concern. On Fri, Oct 9, 2020 at 10:51 AM Marco Guillen Barrionuevo < marcoguillen...@gmail.com> wrote: > 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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