by default citadel is configured to send mail to the usual system acconts into the aide room. Thats:
- root: your system will send mail to this account. for example cron.
- postmaster: messages about errors on your mail system
- abuse: complaints about your service doing harm to s.b. else will usually be directed to that address.
- bbs: like postmaster, but more in use for BBS systems
these are configured in citadels mail.aliases file, where you can change them to any other existing account on your installation. You should test if they are really deliverable if you change them, else you might get blacklisted by RFC-Ignorant.org so your mails might get rejected by other mailservers.
Citadel system warnings (such as startup errors) go to aide too, but this is fixed.