On-demand mail forwarding is a service for email servers with dynamic IP addresses, holding new mail until the server connects and delivers it. It is cost-effective and useful for small businesses and consumers.
On-demand mail forwarding is the configuration settings of an email server that does not have a continuous connection to the Internet, also known as a dynamic protocol. A mail server with a constant connection to the Internet has a static Internet Protocol or IP address. This service uses the ESMTP SMTP profile on port 366. With this configuration, all new mail for the e-mail server is held by the Internet Protocol (IP) service provider. When the mail server connects, received messages are sent and any new messages are delivered.
When there is a dynamic IP address, the IP address changes with each connection. To send/receive email messages reliably, you need an on-demand mail forwarding service. On-demand mail forwarding is also known as ODMR, Authenticated Turn, or ATRN.
Within the mail server software, the mail administrator defines the mail delivery rules and protocols. The documentation or user manual may refer to an ATRN client, take note as it is the same as an ODMR client. You can organize multiple downloads and schedule message distribution to meet the requirements of user communities within this feature.
A good example of this concept and the difference between on-demand mail forwarding and continuous forwarding is the post office. If you have an on-demand mail forwarding service, your mail is held at the post office until you request it. Then all mail addressed to you is delivered, and any mail you wish to send to others is collected and distributed. Customers with continuous relay have a courier who comes to the door with every mail received and another comes to get every package for delivery.
The efficiency of computing resources is exploited by setting the appropriate frequency for this type of service. An on-demand mail forwarder provides the best balance of managing user needs and system resources for the vast majority of email users.
To send and receive emails, the server is programmed to connect at preconfigured standard intervals. The email server connects to the IP service provider, using a specific port and IP address. An authentication process is followed; usually the exchange of security certificates is requested and then the mail. In this scenario, the mail server is the client and the IP provider is the server. Once mail is received and all outgoing mail is sent, the connection closes and the client’s mail server becomes the master server and distributes the received mail to the end user’s mail account.
This type of connection is very common with consumer email accounts, small businesses running their own email services, and large corporations looking to manage system resources. The costs are lower than a static IP address and the inconvenience to the end user is minimal.
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