To decode base64 encoded files attached to mail, there are several tools available.
base64 is a command-line utility tool.
To decode it :
fool@localhost:~$ base64 -di < input_file
where -d : decoding data and -i : ignore non-alphabet characters
This Perl one-liner can do the job as well :
fool@localhost:~$ perl -MMIME::Base64 -ne ‘print decode_base64($_) < input_file
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