[2018-07-19T15:01:56,149][ERROR][org.logstash.Logstash ] java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit
in this part of the file !!
if !([Application] == "smtp" or [Application] == "smtps") {
drop { }
}
The log message you quoted is just the final "something went bad, shutting down" message. The interesting log message comes before that. Seeing the complete configuration would also be helpful.
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