Tip: Speeding up xmail by pointing envvar XMAIL_TEMP to a ramdisk
(here on Linux using a 64 MB ramdisk mounted to /mnt/ramdisk )

mkdir -p /mnt/ramdisk

in /etc/fstab:
tmpfs  /mnt/ramdisk  tmpfs  nodev,size=64M  0  0

then either reboot or use this cmd:
mount /mnt/ramdisk

in xmail start script:
export XMAIL_ROOT=/var/MailRoot
export XMAIL_TEMP=/mnt/ramdisk
export PATH=$XMAIL_ROOT/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

and restart xmail.

The ramdisk size should be bigger than "MaxMessageSize" (unit KB) in server.tab.

This will speed up mail processing (at least incoming mails) significantly.
Here's more info about speed gains:
"The major benefit to memory based file systems is that they are very fast – 10s of times faster than modern SSDs. Read and write performance is massively increased for all workload types."

One can even copy the mostly called programs (for example filters) onto the ramdisk, but then one must use such a PATH line (instead of the above one): export PATH=/mnt/ramdisk:$XMAIL_ROOT/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin


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