CentOS - Dec 2007 - Obtuse-smtpd and Postfix

Hi all..

 

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

2.       To control who of the internal users can receive mail and from
which domain or accounts

3.       To obtain a copy of all         sent mails 

4.       To obtain a copy of all received mails

 

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.

 

Unfortunately, obtuse-smtpd is so old that it works only (don't be
surprised) with old sendmail versions. 

So, I always have to uninstall the in-OS shipped modern sendmail version
and replace it with the proper 

old version.

 

Now:

 

Can Postfix do all this ?

 

Or, at least:

 

Can Postfix work in combination with obtuse-smtpd ? (at the end, obtuse
just calls 

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)

 

Thanks a lot, in advance.

 

M. Leon

 

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On Sat, Dec 01, 2007, Manuel Leon wrote:
>
>   Hi all....
>
>
>   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
You could control access by requiring them to send via the submission port
(587) with smtp-auth either using sasl or dovcot and postfix.
>   2.       To control who of the internal users can receive mail and
>   from which domain or accounts
I think would require some work using Chip Salzenberg's deliver program,
procmail, or some such MDA (Mail Delivery Agent) behind postfix.  Off hand
I can't think of how one would do this directly with postfix.
>   3.       To obtain a copy of all         sent mails
>
>   4.       To obtain a copy of all received mails
These two could be handled using always_bcc in postfix's
main.cf.
>
>   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 gives lots of options for incoming filtering using DNS, amavisd and
clamav etc.  There's extensive documentation on the postfix web site,
http://www.postfix.org/

Bill
--
INTERNET:   bill at celestial.com  Bill Campbell; Celestial Software LLC
URL: http://www.celestial.com/  PO Box 820; 6641 E. Mercer Way
FAX:            (206) 232-9186  Mercer Island, WA 98040-0820; (206) 236-1676

People from East Germany have found the West so confusing. It's so much
easier when you have only one party. -- Linus Torvalde, Linux Expo Canada
when asked about confusion over many Linux distributions.

> 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