From: alice@localhost
To: bob@localhost
Subject: MML with attachment

<#part filename=./examples/attachment.png description="Files can be attached using the filename property."><#/part>

<#part filename=./examples/attachment.png name=custom.png description="Filename can be customized with the name property."><#/part>

<#part disposition=inline>
They can also be inlined.
<#/part>
<#part disposition=attachment name=custom.txt>
To force a text part to be considered as an attachment, you can set up
the disposition and optionally the filename.
<#/part>