Collector not MOM sending alerts

Document ID : KB000091939
Last Modified Date : 18/04/2018
Show Technical Document Details
Issue:
The Collectors are trying to send alerts/actions instead of the MOM. The /var/spool/mqueue directory is filling up the /var directory with email messages.

What properties should be checked on the MOM and collectors? Why would the collectors be trying to send out messages? 
Environment:
Issue was found in APM 10.3 but could impact any supported release
Cause:
   A Management Module was mistakenly placed on the Collector causing the alert actions. 
Resolution:

1) Remove the management module jar from all the collectors. Then restart the Collector
2) Mqueue files are emails to remote locations . To remove these files see links like the following. 
https://www.linuxquestions.org/questions/linux-general-1/delete-files-in-var-spool-mqueue-439030/ https://community.hpe.com/t5/General/Help-in-clearing-out-var-spool-mqueue/td-p/5276091 or any other approach to clear the mail