It depend on which Linux's version you use it seems
I had this problem with Debian I've added the ulimit command INSIDE the script that launch Postfix to avoid the problem On 11/08/2010 01:15 PM, Ralf Hildebrandt wrote:
Using % ulimit -n 8192 % postfix start Postfix is working flawlessliy, but how can I set the OS limits "automagically"? I already edited /etc/security/limits.conf to contain: * hard nofile 8192 * soft nofile 8192 but that results in the aforementioned "fatal: socket: Too many open files" error. Postfix is running on kernel 2.6.x, Debian/GNU Linux.