I have a problem with email sending only on @hotmail.com i get this error
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550 SC-002
Mail rejected by Outlook.com for policy reasons. The mail server IP
connecting to Outlook.com has exhibited namespace mining behavior. If
you are not an email/network admin please contact your Email/Internet
Service Provider for help.
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My domain or IP are not blacklisted.I`m tested my mail with many other domains like @yahoo.com @gmail.com @gmx.com and others and all work perfect but on hotmail i get rejected message.
I`m contacted hotmail to remove us from their blacklist but he did not respond more than one month.