If Microsoft Exchange OWA (Outlook Web Access) is in use, the firewall is usually configured to forward inbound HTTP and/or HTTPS connections (port TCP 80 and TCP 443, respectively) to…
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By default, the Sendio ESP will reject inbound email addressed to unknown recipients. It is possible to override this setting although doing so is liable to open up a “floodgate”…
If your company uses e-mail address not linked to a user such as [email protected], there is an “Unknown Sender Address” setting under the Web Interface > System > Outbound Control tab. By default it is…
Configure your mail server to forward all outbound e-mail to the Sendio ESP. The feature is often referred to as “forwarding to a smart host”. Please refer to documentation for…
The main benefit of enabling outbound e-mail through the Sendio ESP is a feature we call auto-accept listing. Essentially, the Sendio ESP can “learn” about valid e-mail addresses as outbound…
Your Sendio ESP can be configured to handle multiple domains for multiple customers. The Sendio ESP can forward e-mail for each customer to their mail server, whether they have one…
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…