I figured this out just moments after writing to this list, actually.
libpq, the Postgresql Library used by Dovecot, will actually use the
environment variables listed below if their corresponding parameters are
not provided in the connection string:
https://www.postgresql.org/docs/8.1/libp
Hi,
We are trying to set up a Dovecot Docker image with dynamic database
configuration based on environment variables, however the variables do
not appear to be expanded in the "connect=" string of the SQL config.
The documentation states that environment variables, being listed under
global
