Communigate Pro
The integration steps with Communigate Pro are as follows:
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In Communigate Pro, define a system-wide rule to archive emails to a local mailbox
a) Create a new journal mailbox for the purposes of archiving
b) Create a system wide rule as follows (substitute parameter contents with mailbox name)

Refer to the Communigate Pro Documentation for further instruction and information.
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Create an IMAP client connection in MailArchiva, to retrieve mail from the journal mailbox