Hello

we have a in house mail system based on postfix. 
We would like to optionnaly integrate AUTH for SMTP


I wonder if it would be possible to 

have SMTP/postfix listen on   port 25 and say port 26

with the following setttings 

* port 25 does not require AUTH

* port 26 requires AUTH

( we would be restricting  access to port 25 to given subnets ) 


Is it possible ? 

Sincerely,

Fred



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