My hosted domain cannot send mail to Gmail. Have tested several times, to multiple accounts (not solved)

My hosted domain cannot send mail to Gmail. Have tested several times, to multiple accounts (not solved)

Hi,
I get this immediatly any time I send mails to Gmail accounts (including my own).

See this message here:

This message was created automatically by mail delivery software. 
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 

***********@gmail.com, ERROR CODE :550 - 5.7.1 [136.143.188.xx 12] Our system has detected that this message is 
5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 
5.7.1 this message has been blocked. Please visit 
5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 
5.7.1 for more information. x15si4450885plg.155 - gsmtp 

Just an FYI, I cannot even forward or send mails to my own Gmail account from soho hosted mails.  

Any suggestions?

NP


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