"Batch limit reached" error when sending messages in EXM

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Description

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When using the Email Experience Manager (EXM), the dispatch of a large number of messages might fail due to the limitation of sent messages per connection. The following error can be found in log records:
```
MessageTaskRunner worker thread 906 07:46:10 ERROR SendEmailError: ChilkatLog:
 SendEmail:
 ....
 SmtpCmdResp: 452 4.5.3 Service unavailable, batch limit reached.
```
Solution

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To resolve this issue, download and install the appropriate patch available on this page: https://github.com/SitecoreSupport/Sitecore.Support.158128.371959/releases.
Contact Sitecore Support to get a solution for other Sitecore XP versions.

Applies to:

CMS 8.2 Update-7+

Fixed in:

Publication date: June 02, 2020

Last updated: June 02, 2020

Reference number:

371959

Keywords:

EXM