Hello George,
to fetch mail from a server you can use fetchmail and hand that mail to cyrus. I am not sure if you can hand it directly to cyrus or pass it first to an MTA like postfix which delivers email to cyrus.
Ulf
Assuming you have no "intermediary" processing via Postfix that you actually want to happen (for virus scans or what have you), Fetchmail can deliver directly to cyrus via lmtp. That's how I have it setup here...
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