I would like to switch to CENTOS Postfix from sendmail. My current sendmail, in combination with
the very old obtuse-smtpd, allows me:
To control who of the internal users can send mail andto which domain or accounts
This can be accomplished with smtpd_restrictions_classes
To control who of the internal users can receive mail and fromwhich domain or accounts
Ditto.
To obtain a copy of all sent mails
This can be accomplished using always_bcc
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