Supported MIME Types
Add just the type (not the subtype). Text, Video, Audio, Image and Multipart are always supported. Put each type on a single line
Banned File Names
Put each file name on a single line.Files matching this list will never be posted to your blog. You can use wildcards such as *.xls, or *.* for all files
Attachment icon set
Attachment icon size (in pixels)
Attachment template
Note that this template are only used if the¬†attachment is not “inline” or if the email type is “plain”