If you can, please provide the complete message tracking, or mail_logs snippet for this, or other failed XLS attached messages.
Also - with the messages you are seeing this occurring on...
+ Are they usually from the same sender?
+ What is the complete message size?
+ What version of AsyncOS is your appliance running?
+ Have you verified the lastest engine/ruleset is in play on the appliance(s)? Run 'avstatus' - or, run a 'force update to assure the lastest is running ---> 'antivirusupdate force'
It is possible that the files may be have either malformed MIME parts or deeply nested MIME - which may be treated as unreadable by the Sophos engine --- in which case, we would need to get the file itself submitted direct to Sophos for review and possibly updating the engine associated with our OS.
Hope this helps!
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...