Hi list, 

I'm looking for an easy way to add a static prefix "[*EXT*]" to all incoming 
emails, as long as the subject does not already contains this string. 
OpenSMTPD is running as a filtering MX running senderscore filter. 
default action is relay to another host. 

Can OpenSMTPD modify the header conditionally ? 
If so, should I add a filter to the existing "listen" line or should I add a 
new "listen" line with a dedicated filter and chaining listen->action relay to 
local listen->action relay to external ? 


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