ftpmail wasn't working for me so I built a scuffed version in go because fuck perl :^)
I realize you're supposed to toss pid files into /var/run, but because this is intended for use on a shared server without root access I had to be a little creative with where I put it.
Clone the repo, then run go mod download followed by go build -o proftpd_notify.
Move the resulting binary into a folder included in your $PATH and make it executable (eg. chmod +x proftpd_notify && mv proftpd_notify ~/bin).
Required
--------
smtp_user - username used to authenticate with your SMTP server
smtp_pass - password used to authenticate with your SMTP server
smtp_host - SMTP server hostname
mail_to - Recipient email
mail_from - Sender email
Optional
--------
smtp_port - SMTP server port (default: 587)
log_dir - Directory containing your proftpd transfer log (default: $HOME/.config/proftpd)
log_name - Name of the log file (default: transfer.log)
Configuration is done via the notify_config.json file, either in your $HOME directory or under $HOME/.config/proftpd. smtp_user and smtp_pass can alternatively be set using the PROFTPD_NOTIFY_SMTP_USER and PROFTPD_NOTIFY_SMTP_PASS environment variables.
After creating the config file, just run proftpd_notify to start the daemon. The pid file is stored in the same directory as the transfer log, so you can stop the daemon using kill $(cat /your/transferlog/dir/proftpd_notify.pid).
The order in this case doesn't matter - you can run proftpd_notify before or after you've started proftpd.