Distributed electronic mail

Electronic mail (e-mail) on the SCO OpenServer system is handled by two distinct processes:

• The Mail User Agent (MUA) enables users to send, read, and manage mail messages, and transfers outgoing mail to a Mail Transfer Agent.

• The Mail Transfer Agent (MTA) is the group of programs that route and deliver messages to their destinations.

On a networked system, the MTA on the sending system has the additional task of determining whether the mail should be delivered to a local user or sent to another machine on the network, and, if sent to another machine, what communications channel (such as SMTP, the Simple Mail Transport Protocol) to use. When the MTA on the destination system receives the mail message, that MTA forwards the message to the appropriate user.

SCO OpenServer provides a choice of Mail Transfer Agents:

MMDF

(Multichannel Memorandum Distribution Facility), the SCO MTA that is included with the SCO UNIX operating system

sendmail

a commonly used alternative MTA that is also included with the SCO operating system

MMDF offers several substantial benefits over sendmail, including:

• Configuration files that are easy to read and understand.

• The ability for end users to configure their own sorting parameters.

• A larger set of supported delivery agents.

Both MTAs can use a variety of hostname-to-Internet address mapping schemes; the most effective when connecting to the Internet is the Domain Name Service (DNS).

Configuring a mail transfer agent

To configure electronic mail, you must complete the following procedures:

• configuring DNS (Domain Name Service) if desired

• choosing an MTA (Mail Transfer Agent), either at installation time or after the system is installed

• establishing physical connections and configuring networking drivers

• configuring the MTA

Administering a mail transfer agent

Administering a mail system includes regularly:

• monitoring the log file.

• monitoring the mail queue.

• modifying parameters.

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