Authentication required at lmtp transport

[Marten Lehmann]

Hello,

I have configured one mailserver to send messages through lmtp by tcp to 
another server. But I always get

host x.x.x.x [x.x.x.x]: 430 Authentication required

Where can I tell cyrus to allow lmtp-messages from certain IP-addresses 
or ranges?

Regards
Marten
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