In your app's config.py, you should make a mailfrom=<who@wherever> entry, and a similar mailto entry.
SMTPhost should be already be set by base.config_base.py to 127.0.0.1 and you should not need to override this in any way, unless you wish to use a remote SMTP host.
If an app doesn't have a valid mailfrom and a valid SMTPhost it will not send emails.
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