The SMTP server uses the Pascal API MonQuery function to obtain the IPv4 IP addresses defined for the TCP/IP stack. The total number of IPv4 IP addresses that can be defined for the TCP/IP stack is limited to 255 IP addresses. This limit of 255 IP addresses applies to all IPv4 IP addresses, including loopback and dynamic VIPA.
For more information about TCP/IP profile statements, see z/OS Communications Server: IP Configuration Reference.