I assume your "Trash" folder is your spam folder too. That could be why it went there if it was flagged as spam. Runbox does not automatically whitelist they're own addresses.
The only reason I've seen it not validate an address is when the "key" in the link is not correct for the email address listed.
You can go back to the Folder Preferences and save again to get another validation email sent and try that one.
Regards,
Rich
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