[ZendTo] Local sender email address invalid

[Steve Mason]

Hmm I spoke to soon. Went to do a demo, and something is broken.
When I log in as an internal user, and go to do a dropoff, I get: 
Upload Error	

The sender email address you entered was invalid. Use the back button in
your browser to go back and fix this omission before trying again.
 
I did an RPM --update to 3.55, and it didn't help.
 
I don't see any errors in the log.  I thought it might be the regexp in the
config file, but I don't see it, but then I've always had trouble with
regexp...
Here's the relevant text (I think) from the preferences:
 
// the default email domain when just usernames are supplied
  'defaultEmailDomain' => 'kmss.ca',
 
  // regular expression defining the email domain(s) of "internal" users.
  // This example matches soton.ac.uk and *.soton.ac.uk
  'emailDomainRegexp' => '^([a-z]+\.)?kmss\.ca$',
 
  // regular expression defining a valid username for the Login page.
  'usernameRegexp'    => '/^([a-z0-9][a-z0-9\_\.\-]*)$/',
 
Any ideas?
 
Thanks,
 
Steve
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