It has been reported that some mail servers fail to deliver outgoing emails to other servers due to the lack or incorrect settings of reverse DNS lookup.
I try to recall my experiences about the settings of MX and PTR in DNS configuration. Woo, the IP address of the mail server should have a proper PTR record which upon interrogation, shall point to a particular hostname. The PTR does not need to be the same host name or use the same domain as the MX record. However, it does need to point to a hostname that has an A record pointing back to the same IP address.
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