Basically, two daemons are running: receivr.rb and sendr.rb:
- [Receivr] 1 checks the POP3 mailbox and, processes the incoming emails, put remaildrs into the database if needed, then sleeps and loops.
- [Sendr] 2 checks if any email needs to be sent, send it if applicable, sleeps and loops.
The database is a very simple SQLite base at the time, composed of only one table itself containing three columns by email: id, timestamp, and a BLOB containing the marshalled Ruby Mail object to send.
More info at my [blogpost] 3.
The daemons are logging inside their own logs folder. These logs are rotated by [Daemons] 4.
Basic monitoring is offered by the q&d [status.sh] 5 script.
It might. But Daemons has a built-in monitoring, so if any of the script indeed crashes, it will be kicked alive again. Yeah!
The problem is if receivr.rb crashes on a particularly badly-handled message, it might fail at reboot and keep failing. Deleting problematic message in the POP inbox is TODO at the moment.