[pfx] Re: Postfix on Debian 12 (vs exim4)

[Scott Kitterman via Postfix-users]

On October 1, 2024 3:19:42 AM UTC, Crazy Developer via Postfix-users 
<postfix-users@postfix.org> wrote:
>Hello
>
>Long time ago I used Postfix to send automated emails to customers
>(Slackware, 10+ years ago), then moved to another job and I stopped using
>it. Now I'm working on a local network and just configured a local DNS
>server for the LAN and as a first approach I want to setup a local mail
>system and then configure it for the internet (DNS local+internet and MX
>local+internet).
>
>By now I am using a virtual server (VirtualBox) as a "sandbox" to
>experiment safely and the first step is to install Postfix. In the past I
>had only to rename the "sendmail" and configure Postfix. Today I see that
>there is a set of packages "exim4", when I try to install Postfix (from the
>Debian repository, "apt install postfix") it tells that exim4 should be
>removed (automatically) but there are other exim4* packages remaining. My
>doubt is: Should I remove/uninstall all the exim4 packages or just the
>suggested ones? And if so, would it affect something else on the system?
>
>The following packages will be REMOVED:
> exim4-base exim4-config exim4-daemon-light
>
>The easiest would be to learn to use exim4 that comes bundled with Debian
>but surely it is not on other distros. I want to use Postfix as it could be
>installed on any distro, be package manager or sources (just like in the
>old times :)
>
>So... Do I remove all exim4 packages (suggested and all remaining)?
>
>On the next mail I will be asking for help to setup Postfix to work as a
>local service and configure it with Bind9 by adding an MX record to the
>nameserver for it. Once working I will go for an internet configuration.
>
>Thanks for your help and patience

Exim is the default MTA in Debian.  The Debian packaging system enforces having 
only one MTA installed at a time.  That's why it wants to remove Exim when you 
install Postfix.

Assuming you want to use Postfix and not Exim, you should let it remove them.  
Removing non-conflicting Exim components will save you a little hard drive 
space, but won't affect system operation either way.

Once you have installed the postfix package, the sendmail command will be from 
postfix.  No renaming needed.

There are some Debian unique aspects of its postfix package.  Once you have 
installed it, you will find these reasonably well documented in:

/usr/share/doc/postfix/README.Debian.gz

Scott K
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