Yahoo Email 421 4.7.1 [TS03] problem with my vm
I run my own server. Only host my own personal email account on a European VM
And I don't have any delivery problem before but once I move to European I saw this error from Yahoo and apparently all Yahoo email did not the email I sent.
"refused to talk to me: 421 4.7.1 [TS03] All messages from 188.164.12*.*** will be permanently deferred; Retrying will NOT succeed"
Does anyone know what to do with? The help page on Yahoo didn't help. It only says you need to check if there are spam coming out of your server which I exam the log and my mail server is not comprised. I have rDNS, DKIM and SPF setup. Not sure what else I can do.
When I have my server in US, I did not experience any of this. My IP is not on any public RBL.