Zimbra Desktop 7.2.1 / Linux Mint 14.

I try to migrate from Claws-mail to Zimbra. Emails in Claws are in the MH format, one message per file. I suppose that Zimbra can read these emails, but I need to build the sqlite db and the index. I read about a tool called zmlmtpinject but I couldn't find it to check if it is the tool I need.

Some help would be appreciated.