[exim] paniclog after upgrade from 4.90_1 to 4.91

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Author: Sławomir Dworaczek
Date:  
To: exim-users
Subject: [exim] paniclog after upgrade from 4.90_1 to 4.91
Afertupgrade from exim version 4.90_1 to 4.91 messages not sending to external host
Panic log : Delivery status for user@external_domain.com got 0 of 7 bytes (pipeheader) from transport process 13323 for transport smtp

How-to repair this error ?
regards
slawek