Description of problem: It looks like a lot of spam mail gets sent to system accounts like rpm@*, adm@*, etc. These mails are accepted by sendmail and delivered to /var/spool/{rpm,adm,...} where the will stay unread forever using up drive space. Hence sendmail, in its default config should trash such mails. Not sure about the best way to do this. Probaly one should redirect all these accounts to a dummy account, where it gets delivered to /dev/null.
I suggest that a line rpm 550 Daemon does not accept or read mail. is added to /etc/mail/access for the most common accounts.
Sorry, this should read rpm@ 550 Daemon does not accept or read mail.
I want the default to be delivered to root and you need to setup a server machine to have proper spam filtering for today's needs. greetings, Florian La Roche