Looking at this simple greylisting implementation:
http://wiki.exim.org/DbLessGreyListingRun
They use this to create name of grey file:
warn set acl_m_greyfile = /var/spool/exim/greylist/${length_255:\
${sg{$sender_host_address}{\N\.\d+$\N}{}},\
${tr{$sender_address,$local_p...@$domain}{/\040}{;} }}
Is there anyway to replace any characters in grey file that are not a-z or
A-Z or @ with a simple _ underscore? Seems like it would be safer to
exclude any special characters and should be just as effective. I heard
some comments by others elsewhere that this implementation was not trusted
because of that. I like how incredibly simple it is though.
Matt
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