I have this posting out for couple of days and many Techies from this mailing list responded with suggestions. I did not understand any one of them because I am a NEWBIE and I was thinking more closed in a SQL box and thinking of Postfix using the backend PGSQL in some what a conventional way - database, schema, quiries, so on...

So today with good night sleep, I got up and read "POSTFIX - The Definitive Guide" by Kyle D. Dent & it made sense. So now I understand that in Postfix there are MAPS for Data/Information. Each MAP handles a particular data. For example a MAP for Virtual Domains handles a list of Virtual Domains, an Aliases Map has a list of emails pointing to other emails (forwarding), etc. One has to configure each MAP to retrieve its underlying data/information from a table or a database.

This is very good design used in Postfix but not understanding it clearly got me down. Now I can setup one or more MAPS to connect to backend PGSQL as Imake progress.

Thank you all.

I have only one more wish; I wish there was a list of all the MAPS used in Postfix?

Jennifer King

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