> I would like to switch to CENTOS Postfix from sendmail. My current > sendmail, in combination with > > the very old obtuse-smtpd, allows me: > > > > 1. To control who of the internal users can send mail and > to which domain or accounts This can be accomplished with smtpd_restrictions_classes > 2. To control who of the internal users can receive mail and from > which domain or accounts Ditto. > 3. To obtain a copy of all sent mails This can be accomplished using always_bcc > 4. To obtain a copy of all received mails Ditto. > > > Obtuse-smtpd is very easy to configure and very effective. It takes > control of all smtp activities over Port > > 25 and, after filtering and checking, passes the safe mails to sendmail > for final delivery. Obtuse can, also, > > check for addressability, through DNS, of the mail sender and other > useful features. Postfix has extensive capabilities for this as well. > Can Postfix do all this ? Yes. > > > Or, at least: > > Can Postfix work in combination with obtuse-smtpd ? (at the end, obtuse > just calls Good question. I've never heard of obtuse-smtpd, so I can't tell you, but Postfix generally acts like sendmail on the outside, but completely different on the inside. > sendmail for the real mail delivery; it only receives mail in port 25 > and checks what it > > receives with its rules, allowing or rejecting at the end) Postfix does that as well. Check out Ralf Hildebrandt's postfix resources at <http://www.arschkrebs.de/postfix/>. Ralf is also the co-author of an excellent Postfix book. You should particularly read the 3 pages about restriction classes. Barry