Blocked from sending mail

I cannot send any mail from my server since 2 weeks now, i am getting the following errors

I have already checked for spam, malicious files and secured the server more.. what do i need to do to get unblocked? The IP is also not in any list

host gmail-smtp-in.l.google.com [74.125.22.27]

SMTP error from remote mail server after end of data:

550-5.7.1 [174.142.68.41 1] Our system has detected an unusual rate of

550-5.7.1 unsolicited mail originating from your IP address. To…

Blocked from sending mail
Digital Point

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