I am running Postfix on an hosted VM as smart host and for mail buffering if my exchange is offline.
Some mails get rejected because of:
pmg postfix/smtpd[2687]: connect from mx.domain.tld[xx.xxx.xx.xxx]
pmg postfix/smtpd[2687]: NOQUEUE: reject: RCPT from mx.domain.tld[xx.xxx.xx.xxx]: 554 5.7.1...
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