My notes, things I have learned, and documentation I have created.

time -p dd if=/dev/sda5 of=/dev/null bs=1024k count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 25.2325 seconds, 42.6 MB/s
real 25.26
user 0.00
sys 1.82

This transferred 1 gigabyte of data in 42.g megabytes per second.

formail -Y -s sendmail -odq username < /var/spool/mail/username

sendmail -v -qRnewaddress

For example:

formail -Y -s sendmail -odq james < /var/spool/mail/james

sendmail -v -qRjames@newmailbox.com