Have tried to test several email clients. Most seem to have a slightly different scheme storing the attachment/email info.
Have adjusted the cases I found.
[MOD] MailIn HTML mail now creates wiki pages in HTML format
[FIX] Mailin logs the correct user
[SEC] Mailin checks the user permissions (of the sender). 
Previously the checks would have been for the user currently logged on, triggering the mailin check.
Updated for wiki mailIns, but not for article mailIns.
Note that senders email address can be spoofed. So, there is no real security in mailIn
[FIX] Mailin account "attachments" setting is checked.