How to tar.gz old maillog & messages during log rotation?

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This is a cpanel question posted by sneader on 01 February 2010

These logs are automatically tar.gz’d during the log rotation process:
However, these logs are not… and I’d like them to be, since /var is a little low on disk space:
Any pointers in accomplishing this, and any ideas why some logs are tar.gz’d and others are not?

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