Re: [Exim] ACL to ALLOW only mentioned attachments type and …

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Autor: Chris Edwards
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A: exim-users
Assumpte: Re: [Exim] ACL to ALLOW only mentioned attachments type and block *
| > Can i write a ACL which allows only specified attachments type and
| > BLOCKS all *

|
| I'm wildly guessing here, as I haven't tried to see if this actually works
| with the way Exiscan hooks into the ACLs, but how about:

|
| deny message = Bad attachment
|      !demime = txt

|
| if you only wanted to allow attachments with a "txt" extension?


Interesting. Our management recently suggested a "default deny" policy
for file extensions. Quite tempting, considering the state of M$ insecurity.
I hate to think how many dangerous filetypes are not on our banned list.

Of course, outside of the M$ world these are arbitary file names. A unix
user might be mailing yesterday's results in a file called "results.thu"
and get blocked. Not really practical here.

--
Chris Edwards, Glasgow University Computing Service