Installing Postfix version that is newer than offered in the Debian repository.

[Mick]

Hi Postfix users,

I would like to try and install a later version of Postfix (and 
postfix-mysql) than the Debian stable (Jessie) repository currently 
offers (2.11.3-1). I've looked at building Postfix 3.1 from source, but 
I'm finding it hard to follow the instructions. This is wholly down to 
*my* lack of understanding regarding the building process and 
dependences I would need to build in for my system and no reflection on 
the author.

As an alternative to building from source, I am also considering the 
easier option of installing version 3.0.4-5 from the Debian testing 
source (Stretch) using a pinned source list.  This leaves me with a 
question on dependencies.  Should I install postfix dependencies from 
the Debian Stretch source list which may upset Jessie's stability, or 
instead download them from Jessie which may cause Postfix problems ?

If I were to attempt to build 3.1, would it be better to first install 
2.11 and get that up an running? I ask as there may be less dependencies 
to build into 3.1, and certainly less to configure if the main.cf and 
master.cf already exist.

To sum up, I don't know which way to go, though I'm thinking 3.1 would 
be the best route long term. Any suggestions welcomed.


Best wishes,
Mick.