EXM fails to send multiple emails at the same time

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Description

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The issue occurs when EXM tries to send multiple automated emails at the same time. If the same message is triggered multiple times in a short period of time, only one message is sent. The EXM log shows messages as follows:
```
ManagedPoolThread #12 16:07:59 DEBUG Job Sending message ([Job_ID]) already running. Not started.
```
Solution

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To resolve the issue, consider one of the following options:
- Migrate EXM to Sitecore XP 9.0 Update-1 or higher (recommended).
- Download and install the patch compatible with the affected product version found on this page: https://github.com/SitecoreSupport/Sitecore.Support.137266/releases.

Applies to:

EXM 3.4 Initial Release - 3.5 Update-2

Fixed in:

EXM 9.0 Update-1

Publication date: January 20, 2020

Last updated: August 20, 2020

Reference number:

137266

Keywords:

EXM