[Dovecot] Some Information about compression rates to expect using zlib/xz compression

[Robert Nowotny]

compression : xz, Level 6

here some compression rates I experienced : 

Diskspace usage : 
user1:  uncompressed :  2.3GB   --> compressed 1 GB
user2:  uncompressed :  6.2GB   --> compressed 3.9 GB

just for your reference

Ing. Robert Nowotny
Rotek GmbH
Vienna/Austria