Not all users will be retrieving mail on a daily basis. Some users will be out of the office for extended periods, either due to travel or illness, and so the server disk space requirements for these users will be larger than normal.
Another important element to consider is that incoming mail is handled by the SMTP server, which does not use the same mail database as the POP3 mail server. After the incoming mail is received by the SMTP mail server, it must be copied to each recipient’s POP3 mail database. During this copy process, a single mail message will require disk space for the copy in the SMTP queue and for the copy in the recipient’s database.
If there are multiple local recipients for a single incoming message, then the mail server must allocate space for a unique copy of the message to be stored in each of the recipients mail folder. Large messages sent to a large number of users will result in rapid disk space consumption.
Finally, the number of users accessing your POP3 server will make a big difference in your disk space requirements in an overall manner as well. Do not forget to multiply the per-user requirements by the number of users on your system.
STEP: If the server you wish to use for Unoverica Message Transport already contains an operational TCP/IP stack, go to Chapter 3: Installing and Starting Unoverica Message Transport. Otherwise, go to Chapter 2: Configuring TCP/IP.
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