[lug] mail server preference
jafo at tummy.com
Fri Dec 8 15:53:45 MST 2006
On Fri, Dec 08, 2006 at 01:05:43PM -0700, Ken MacFerrin wrote:
>> Because of the alternatives system, it's not a problem at all.
>Yup.. and most MTAs provide a replacement "sendmail" binary for
>backwards compatibility as well.
That's what the alternatives system deals with:
guin:~$ rpm -q --provides postfix
config(postfix) = 2:2.3.3-2
postfix = 2:2.3.3-2
So, the postfix package provides /usr/sbin/sendmail. But, when you check
guin:~$ ls -ld /usr/sbin/sendmail
lrwxrwxrwx 1 root root 21 Mar 26 2006 /usr/sbin/sendmail -> /etc/alternatives/mta
It's actually a link to /etc/alternatives:
guin:~$ ls -l /etc/alternatives/mta
lrwxrwxrwx 1 root root 26 Nov 19 22:03 /etc/alternatives/mta -> /usr/sbin/sendmail.postfix
That's why you can install postfix and then remove sendmail, without them
conflicting by being installed at the same time.
Come see the violence inherent in the system!
Help! Help! I'm being repressed! -- Monty Python and the Holy Grail
Sean Reifschneider, Member of Technical Staff <jafo at tummy.com>
tummy.com, ltd. - Linux Consulting since 1995: Ask me about High Availability
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