Hi,

I'm looking into how plausible it would be to add compression support to 
Maildir messages. The basic idea is to simply compress the entire message 
(file) just before writing it to disk, and decompressing it as soon as it 
is read. For transparent migration/integration, I could postfix (no pun 
intended) the messages with .lzo (that's the algorithm I'm thinking about 
using because of fast decompression) if they are compressed so that both 
could be handled the same way.

Could this be done using filters at the delivery stage? If so, could 
something similar be applied to decompress the message at read stage (for 
POP/IMAP delivery)?

If it cannot be done with filters, can anyone point me in the right 
direction? Where are the file read/write access points in the code?

Thanks.

Gordan

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