# Logstash pipeline workers and imap input plugin **URL:** \ **Category:** Logstash\ **Created:** [July 16, 2020, 7:06pm UTC](https://discuss.elastic.co/t/logstash-pipeline-workers-and-imap-input-plugin/241534 "2020-07-16T19:06:32Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Diptee](https://avatars.discourse-cdn.com/v4/letter/d/76d3ee/32.png) [@Diptee](https://discuss.elastic.co/u/Diptee)\ **Post date:** [July 16, 2020, 7:06pm UTC](https://discuss.elastic.co/t/logstash-pipeline-workers-and-imap-input-plugin/241534/1 "2020-07-16T19:06:32Z")
Hi, We have configured logstash(using default pipeline configuration). We have just one pipeline running. When I start logstash I see it has 4 pipeline workers and batch size of 125. I am using IMAP input plugin to process emails from server. I see that all 4 workers establish connection with IMAP. I want to know if all workers connect to IMAP endpoint, do all workers operate parallel or just 1 worker communicates? Thanks in advance for your help. Thanks ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [July 16, 2020, 7:20pm UTC](https://discuss.elastic.co/t/logstash-pipeline-workers-and-imap-input-plugin/241534/2 "2020-07-16T19:20:34Z")
The worker threads do not connect to IMAP. An input thread connects to IMAP and dispatches events to a queue that the worker threads read from in parallel. The execution model is described [here](https://www.elastic.co/guide/en/logstash/current/execution-model.html). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [August 13, 2020, 7:20pm UTC](https://discuss.elastic.co/t/logstash-pipeline-workers-and-imap-input-plugin/241534/3 "2020-08-13T19:20:48Z")
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