How do I get a SMTP session log in Exim?

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http://serverfault.com – Sometimes when debugging SMTP issues the standard maillog is not enough and I need to see the full SMTP session. In postfix I add the problematic IP to "debug_peer_list" which will enable the session log and other debug information for only that IP. Is there a similar thing in exim? I have only found references to "running exim in debug mode" which apparently causes ALL sessions to be logged which I fear will quickly write tons of unnecessary logs, cause heavy disk I/O, and make it hard to find the transaction in question TL;DR: What is the best way to get a full SMTP transaction log from a (HowTos)