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bt spam bot issues

the issue has popped up once again. trying to send an email to vistaprint. have been replying back and forth for a few days until today auto rejected with the below:

"
[email protected]
host eu-smtp-inbound-1.mimecast.com [91.220.42.241]
SMTP error from remote mail server after RCPT TO:<[email protected]>:
550 csi.mimecast.org Poor Reputation Sender. - https://community.mimecast.com/docs/DOC-1369#550"

i've checked with vidahost who say our reputation is good, said something about them checking ptr record, or a dkim record and all was good, yet now every email we send vistaprint from any address is rejected instantly. so frustrating
 
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