If you ever run into an issue with Pine where it acts like it sends mail but actually doesn't:
Log in to alpine.cse.unr.edu: `ssh <YOUR CSE_ID>@alpine.cse.unr.edu`
Become root: `sudo su`
Check to see if the postfix user exists:
`getent passwd postfix`
Check the status of the postfix service:
`sudo systemctl status postfix`
If it's not on, or if it's reporting errors, go ahead and restart the service (don't worry you won't break something that's already broken!):
`sudo systemctl restart postfix`
--and if for whatever reason the postfix service isn't enabled to start on boot-up (i.e. alpine gets reset):
`sudo systemctl enable postfix`