Hi,
	I've been working with dovecot SiS for a long time without any problem. 
This is my configuration for SiS:
mail_attachment_dir = /mail/users/attachments
mail_attachment_fs = sis posix
mail_attachment_hash = %{sha1}
mail_attachment_min_size = 128 k
	With this configuration, I have, for example:
# ls -l 
/mail/users/attachments/27/d1/27d1904ac9947945bf48ea545ec278940d840ed1*
-rw------- 12 vmail vmail 142914 may  6  2013 
/mail/users/attachments/27/d1/27d1904ac9947945bf48ea545ec278940d840ed1-090d88269ad28851f14b0000a9061514
...
	And every file is a hard link to 
/mail/users/attachments/27/d1/hashes/27d1904ac9947945bf48ea545ec278940d840ed1
	For the documentation I have found, 
"27d1904ac9947945bf48ea545ec278940d840ed1" is a hash of the attach 
content, but what does the other part of the filename (the 
"090d88269ad28851f14b0000a9061514" means)
	My question has come to my mind because I need an easy way to find the 
mailbox where this attach is referenced from.
-- 
Angel L. Mateo Mart?nez
Secci?n de Telem?tica
?rea de Tecnolog?as de la Informaci?n
y las Comunicaciones Aplicadas (ATICA)
http://www.um.es/atica
Tfo: 868887590
Fax: 868888337