I'm sorry you had trouble with sending out email. The errors you provided showed that at the time the emails were returned the server's mail IP was in an RBL at Spamhaus. The IP has been removed and is no longer in the RBL, you can verify this here:
The IP was not in the RBL at the time you began sending your emails but was in the RBL when the second batch began to be sent.
Thank you for getting in touch with us regarding this issue. I hope this clarifies this for you.
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