SYMPTOM:
When you try activated a new installation in the licensing site, https://licensing.microstrategy.com, the following message appears.

The Server reject one or more recipient addresses. The server response was: 501 5.5.4 Invalid Address
CAUSE:
The problem is in the email address, this have invalid characters. In this case, "," comma is detected as an invalid character.

ACTION:
Remove the invalid character and put the corrected email addresses.

For more information about these steps, refer to the following Strategy Knowledge Base technical note:
KB13454KB5300-801-0757: How to activate a server installation in MicroStrategy 8.0.1