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Home > Success Center > Network Performance Monitor (NPM) > Knowledgebase Internal > Email alerts to multiple recipients fail with the error: An invalid character was found in the mail header: ','

Email alerts to multiple recipients fail with the error: An invalid character was found in the mail header: ','

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Updated March 11th, 2016

Issue:

After an NPM upgrade, alerts addressed to multiple recipients fail with the following error in the Event log:

An invalid character was found in the mail header: ','.

Cause:

Use of comma separator (,) to delimit multiple email recipients may be the cause of the issue.

Workaround:

Use semicolons in such cases instead of comma separators:

  1. Click Start > All Programs > Solarwinds Orion > Alerting, Reporting, and Mapping > Advanced Alert Manager.
  2. Click Configure an Alert > Trigger Actions > Add a Email/Page Action.
  3. In the To: and CC: fields, replace the commas with semicolons to separate multiple recipients.
  4. Verify if the mail alerts are received by the recipients.
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