Jason wrote:
> Hello everyone,
> we are using Postfix with AMaViS-new to filter all incoming and outgoing
> emails for spam and virus messages. One of our applications
> (unfortunately closed source and for accounting purposes) attaches an
> base64 encoded asc file to the message, which is wrongly recognised as
> 'exe-ms' file and is banned due to our configuration.
> Is there a way to set up a recipient based whitelist mechanism? I just
> found a whitelist mechanism for spam handling. Our application send the
> email only to one address.
> Perl Version is 5.008008
> AMaViS-new version is 2.3.3 (20050822)
> Postfix version is 2.2.9
> Regards,
> Jason
The simple solution is to make that user a banned_files_lover
@banned_files_lovers_maps = ( [qw( [EMAIL PROTECTED] )] );
but of course this means that anyone can send banned files to this
address.
The more complex solution uses per-recipient banned rules settings.
Possibly something like this (not sure if the syntax is precisely
correct, but this did work for me):
@banned_filename_maps = (
{'[EMAIL PROTECTED]' => 'ALLOW_ASC',
'.' => 'DEFAULT'}
);
%banned_rules = (
'ALLOW_ASC' => new_RE( # create a custom banned rules set
[qr'.\.(asc)$'i => 0], # pass .asc files
# above we allow exceptions to the current banned files
# below we repeat the what we have in $banned_filename_re
qr'\.[^./]*[A-Za-z][^./]*\.(exe|vbs|pif|scr|bat|cmd|com|cpl|dll)\.?$'i,
[ qr'^\.(rpm|cpio|tar)$' => 0 ], # allow any in Unix-type archives
qr'.\.(vbs|pif|scr|cmd|cpl|bat)$'i, # banned extension - basic
qr'^\.(lha|cab|dll)$', # banned file(1) types
),
'DEFAULT' => $banned_filename_re, # gotta have this
);
These settings assume you are using $banned_filename_re and must be
placed after the $banned_filename_re section. Search for
@banned_filename_maps in
http://www.ijs.si/software/amavisd/release-notes.txt for more info.
Or you could possibly simply allow .asc files to everyone which
normally should not be a risk. Simply place this allow:
[qr'.\.(asc)$'i => 0], # pass .asc files at this point
# just before the rule that bans it:
qr'^\.(exe-ms)$', # banned file(1) types
Gary V
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