alarms are not getting generated by mail

Document ID : KB000111006
Last Modified Date : 14/08/2018
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Emails are not getting triggered for alarms.
Test mail is working fine.
NOTIFIER.OUT shown below error
Using SMTP host
Using return address ""
sendmail failed 501 5.1.3
Invalid address test mail is working fine.
Spectrum 10.1.x
Spectrum 10.2.x
Check the filters
Ensure the email ID's are seperated with "," and not with ";"
Now email will start trigger