Daniel Pocock wrote:

>I'm trying to use postfix-to-mailman.py

>According to the instructions in the script itself,

>a) I should set MTA=None
>b) I should run "genaliases" to generate the data/virtual-mailman file

>However, when I set MTA=None, I get this error from genaliases:

>"genaliases can't do anything useful with mm_cfg.MTA = None"

That is correct output.

>If I set
>  MTA = 'Postfix'

>then the virtual-mailman file is generated correctly.

>If I understand correctly, the presence of the virtual-mailman is not 
>essential, but if it is present, then Postfix can reject (rather than
>bouncing) mail to unknown lists and avoid backscatter from spam.

Indeed, that is why it is preferable not to use the postfix_to_mailman.py 
script at all.  This script has several limitations, one of which is the 
backscatter to invalid addresses.  I believe the virtual Mailman configuration 
is a much better alternative, and I am not sure why this older script is still 
in the Mailman Debian package.

>Can somebody please clarify if this virtual-mailman file is still supported?  
>Or should the instructions in the script be changed to remove references to 
>genaliases?

Yes, it is very much still supported if using virtual domains, please read 
these Postfix setup instructions, they are the definitive instructions for 
Mailman:

http://www.gnu.org/software/mailman/mailman-install/postfix-integration.html
http://www.gnu.org/software/mailman/mailman-install/postfix-virtual.html

In fact the Exim installation guide packaged with Debian Mailman makes use of 
these files in an alternative configuration example.

Thanks.
Andrew. 


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