[Dovecot] mail_executable's process environment

[Mike Malsman]

Hello,

I recently had to get Dovecot 1.1.4 to write to a "pop3/imap-before- 
smtp" db such that my MTA could permit relay after a successful  
authentication with Dovecot.

The 'pop3' and 'imap' processes are executed only after a successful  
auth, so replacing them with wrappers which write to the db seemed the  
natural choice.  Lo and behold, someone thought of something like  
this, as the 'mail_executable' directive exists - neat.

Upon inspection of the processes' environment I'm pleased to see that  
there's a load of useful information in there.  However, one essential  
component in my case is the destination network address, which is  
missing.  I added it with the attached patch, exposed as 'LOCAL_IP'.   
Works for me.

Is this something that would be useful to anyone else?

-Mike

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