The stats on my posts about Exim+Logstash have gone a bit daft in the last week or so.
It appears that a nice person on the Nagios Forums answered a question about using NLS with Exim by linking to here (thanks!).
If you’re visiting from those forums, please note that I’m more than happy to answer questions (and really rather flattered that you’re asking) but… *please* make sure you read all the posts, in order, and grab the associated examples, config files and/or patches from Github. There are links right there in the articles.
If you do that then you should be good to go. If not, ask away.