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This is a good example of connecting complex systems with simple interfaces.
Benefits of the Postfix (key, value) query interface: You can implement Postfix lookup tables first with local Berkeley DB files and then switch to LDAP or My SQL without any impact on the Postfix configuration itself, as described under "Preparing Postfix for LDAP or SQL lookups" below.
Examples are the local_recipient_maps that determine what local recipients Postfix accepts in mail from the network, the mydestination parameter that specifies what domains Postfix delivers locally, or the mynetworks parameter that specifies the IP addresses of trusted clients or client networks. Despite the difference, Postfix lists are described here because they use the same underlying infrastructure as Postfix lookup tables. Trying to set up both Postfix and LDAP or SQL at the same time is definitely not a good idea.
You can save yourself a lot of time by implementing Postfix first with local files such as Berkeley DB.
This has been beneficial for us because in our environment because our business users provide data to us in the form of Excel spreadsheets.
When you do this, you should use the postmap(1) command again, to verify that database lookups still produce the exact same results as local file lookup: Be sure to exercise all the partial address or parent domain queries that are documented under "table search order" in the relevant manual page: access(5), canonical(5), virtual(5), transport(5), or under the relevant configuration parameter: mynetworks, relay_domains, parent_domain_matches_subdomains.
I have seen your previous tips (Export data from SQL Server to Excel and Different Options for Importing Data into SQL Server) related to working with Excel and SQL Server data.
The main command used in one of the tips is OPENROWSET.
Postfix uses lookup tables to store and look up information for access control, address rewriting and even for content filtering.
All Postfix lookup tables are specified as "type:table", where "type" is one of the database types described under "Postfix lookup table types" at the end of this document, and where "table" is the lookup table name.
We always upload the data to a table and then begin the process.