To ensure remote mail servers reliably accept SMTP connections from the Sendio ESP, first determine the public IP address associated with it and then ensure a corresponding PTR record is…
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To ensure remote mail servers reliably accept SMTP connections from the Sendio ESP, first determine the public IP address associated with it and then ensure a corresponding PTR record is…
Yes. Many mail servers will not properly accept or process email coming from IP addresses that fail a reverse DNS lookup. Please review this FAQ for instructions on setting up…
Many mail servers perform a Reverse DNS lookup on the originating IP address of an incoming SMTP connection. If the result of such lookup fails or the result does not…