Ideal way to finding errors in Exim's log file

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http://serverfault.com – I have a HUGE massive Exim mail log. What is going to be a good way to go through this email log and pull out all the common and other error types so I can go in and look them up and see which ones need to be fixed? Would using grep to find error types work then extract them? Is there a script or tool that already does this? For example I have an error like R=lookuphost T=remote_smtp defer (-45): SMTP error from remote mail server after MAIL FROM and SMTP error from remote mail server after end of data: host mx-apac.mail.gm0.yahoodns.net []: 451 Message temporarily deferred (HowTos)