Postfix is rejecting some incoming emails ("Client host rejected: cannot find your hostname")

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Postfix error. 450 4.7.1 Client host rejected: cannot find your reverse hostname Postfix error. 450 4.7.1 Client host rejected: cannot find your reverse hostname
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DevOps & SysAdmins: SMTP Server 550 Access denied - Invalid HELO name (4 Solutions!!) DevOps & SysAdmins: SMTP Server 550 Access denied - Invalid HELO name (4 Solutions!!)
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