What are the scenarios that can result from using SMTP protocol for delivering e-mail messages?
What will be an ideal response?
When using the SMTP protocol for delivering e-mail messages, any one of the following scenarios could result:
* The sending SMTP server contacts the recipient's server and sends the e-mail message directly.
* The sending server cannot contact the recipient's actual SMTP server for some reason and tries to contact and deliver the message to the recipient's first back-up server.
* The sending server cannot contact the recipient's actual SMTP server or its first back-up server. Thus, the message is delivered to the recipient's second back-up server.
* The sending server cannot contact any of the recipient's SMTP servers. In this case, the sending server will hold on to the message and try to resend it later. It will keep retrying periodically for a set period of time, such as five days, until it succeeds in sending it or returns an error message to the sender.
You might also like to view...
Web pages can contain links to other Web pages called jumpers
Indicate whether the statement is true or false
A technician needs to install software onto company laptops to protect local running services, from external threats. Which of the following should the technician install and configure on the laptops if the threat is network based?
A. A cloud-based antivirus system with a heuristic and signature based engine B. A network based firewall which blocks all inbound communication C. A host-based firewall which allows all outbound communication D. A HIDS to inspect both inbound and outbound network communication