Installing Pelican on OS X is not quite as simple as most things.
Some of the most helpful features in linux terminal is the ability to
1) tab for autocomplete
2) command history using the arrow keys.
However, these are not always enabled for new users.
How to fix kernel panic-not syncing: VFS: unable to mount root fs on unknown block(0,0)
At times you need to find out how many values exist in a table with a total count greater than X. Perhaps this is for a report or debugging.
I work a lot with application servers and virtual machines.
While these are not mail servers they do need to be able to send out email for various reasons.