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”