Postfix: Logs

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Goodday ispCP users,

I'm not good in English. I'm sorry.

I am using ispCP on my Debian servers. Postfix is logging email traffic. But every two days, I got a new log and the old one will be renamed to mail.log.1 or 2 or 3 etcetera.

We have to log email traffic up to 6 months here in Holland. Do you guys now a way to do that? Is there a config file or anything? Or is it possible to say that logs can be 100Gig's, so he will log more in one log.

Kind Regards,

Simon.