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If you use AWS and try mailing a report to multiple emails it fails with:

Mailing Error Failed to send data [SMTP: Invalid response code received from SMTP server while sending email. This is often caused by a misconfiguration in Outbound Email settings. Please verify the settings at Administer CiviCRM >> Global Settings >> Outbound Email (SMTP). (code: 554, response: Transaction failed: Domain contains illegal character)]

Under Email Delivery, it does not like the comma in the comma separated format that is supposed to be used for multiple email addresses.

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You can only put one email in the TO field but as many as you like in comma separated format in the CC field.

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Not sure if there is configuration necessary in AWS to change this behavior but heads up for those on AWS.

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