The rumor is that domainepublic.net treats Microsoft’s mail server with the same reciprocity of Microsoft’s treatment of other mail servers and thus effectively blocks MS.

IIRC, small email services are forced to solve a CAPTCHA to prove to MS that their server has a human administrator before the server can connect to MS’s server. Is that true?

Can anyone confirm or deny the rumor as well as whether MS forces other ESPs to solve CAPTCHAs? I would be quite interested in having an email account that blocks MS until an MS admin solves a CAPTCHA (which I assume would not happen).