Unable to send email via JavaMailInvalid Addresses message.
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We have a FusionAuth server that refuses to send email. The handy email test tool in v1.16 tells me
Unable to send email via JavaMailInvalid Addresses. What could this mean? - 
I'd confirm you can send email via the configured SMTP servers using the command line (swaks is a good tool) to take FA out of the equation.
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It looks like "updating" the password with the same value it had before resolved the issue. Weird.
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@dan can you please elaborate where to do this on command line?
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I'm not sure what you are asking for, but have found swaks to be a good tool for testing SMTP functionality from the command line.
Here's the swaks website/docs: http://www.jetmore.org/john/code/swaks/
Does that help?