The article has hyperlinks in it, e.g. to this: https://learn.microsoft.com/en-us/answers/questions/5786144/all-sending-ips-temporarily-rate-limited-(451-4-7 h

The article has hyperlinks in it, e.g. to this: https://learn.microsoft.com/en-us/answers/questions/5786144/all-sending-ips-temporarily-rate-limited-(451-4-7 https://learn.microsoft.com/en-us/answers/questions/5786144/... which comes from an ESP serving millions of users.