Is possible to override Dovecot variables or Sieve env vars and extdata lookups

MRob mrobti at
Mon Mar 19 06:40:46 EET 2018

Are the dovecot environment variables mutable? I'd like to override 

set "${env.vnd.dovecot.username}" "someuser at"

Or better, I prefer to override %u Dovecot variable during the userdb 

Is either possible?

PS, when Sieve does extdata lookups for username key, where does 
username come from? %u?  Does an override as above change the dict 
lookup key for extdata?

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