I would like to mount a mailbox on the side of a column at my entryway. Every mount I have seen points the mailbox opening straight outward, away from the column center. However I would like my mailbox to be parallel to the column center.

Here is some ascii art to illustrate.
* Symbol for the column: `[]`
* Symbol for the mailbox, with front/back at the ends: `|`

Standard mount, looking down from the top:
```
[]
|
```
What I’m looking for, also looking down from the top:
```
[]|
```

Has anyone tried this before? Is there a set of hardware I can buy to achieve this?

**EDIT**

The column is plywood, with a slight taper reducing the width from ground toward ceiling.

The mailbox is a standard aluminum rounded-top mailbox.