I'm confused about the relationships between procmail, sendmail, and postfix. Sendmail is an SMTP agent for sending mail while procmail is a mail filter which filters incoming and outgoing mail, however, postfix is the actual mail daemon that allows you to check mail via POP3 and allows you to send mail via sendmail. Do I understand this correctly. Can someone explain how these programs used together or are the used together at all? thanks for your time!
