The minimum required RAM is 64 megabytes. TABLE 2-3 below lists the memory requirements for IMAP- and POP3-based systems.
TABLE 2-3 Memory Requirements for IMAP and POP3 Systems Number of Users
Physical Memory for IMAP4
Physical Memory for POP3
100
178 MB
165 MB
500
375 MB
320 MB
1,000
622 MB
492 MB
5,000
2.6 GB
2.0 GB