[exim] exim log *** truncated ***

Hello,

In exim_rejectlog we are seeing log being truncated with tag *** truncated
*** when a log entry/email header as more then 100 lines.

Recently there are many cases of this because of office365 extended headers.

I was unable to find anything related with this. Is there any configuration
that allows more then 100 lines per entry?

Thank you