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my $to = $user->email;
$c->stash->{email_out} = {
...
if (not scalar @{$c->error}) {
    $c->log->debug("*** Email sent! $to ($enc_string) ***");
}

__PACKAGE__->config->{'View::Email::Template'} = {
    template_prefix =>  'emails',
...
        }
    },
};

[debug] Path is "send_activation_email"
[debug] Arguments are "<username goes here>"
...
[debug] Rendering template "emails/activation.tt"
[debug] C::V::Email uses specified content_type text/plain.
[error] no sender