In the last months and years, the default `mime_types.conf` of rspamd has changed and it might be also useful to make some adjustments to the weight of certain file extensions.
This PR is removing all file extensions from `mime_types.conf` which are already in rspamd's default configuration at [rspamd/src/plugins/lua/mime_types.lua](https://github.com/rspamd/rspamd/blob/master/src/plugins/lua/mime_types.lua). If file extension is not present or has a different score compared to rspamd default, it is still in the list.
There are also a few major differences to certain file extensions, which might be useful to discuss and carefully adjust. For example, `.exe` files are rated very 'badly' due to high chance of being malicious, so are other extensions like `bat`, `cmd`, etc.
Current suggestion:
```lua
# Extensions that are treated as 'bad'
# Number is score multiply factor
bad_extensions = {
apk = 4,
appx = 4,
appxbundle = 4,
bat = 8,
cab = 20,
cmd = 8,
com = 20,
diagcfg = 4,
diagpack = 4,
dmg = 8,
ex = 20,
ex_ = 20,
exe = 20,
img = 4,
jar = 8,
jnlp = 8,
js = 8,
jse = 8,
lnk = 20,
mjs = 8,
msi = 4,
msix = 4,
msixbundle = 4,
ps1 = 8,
scr = 20,
sct = 20,
vb = 20,
vbe = 20,
vbs = 20,
vhd = 4,
py = 4,
reg = 8,
scf = 8,
vhdx = 4,
};
# Extensions that are particularly penalized for archives
bad_archive_extensions = {
pptx = 0.5,
docx = 0.5,
xlsx = 0.5,
pdf = 1.0,
jar = 12,
jnlp = 12,
bat = 12,
cmd = 12,
};
# Used to detect another archive in archive
archive_extensions = {
tar = 1,
['tar.gz'] = 1,
};
```
**As a important reminder**: For all remaining and additional file extensions and score weights, please check above default rspamd configuration!
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