Web Reference: The postmap (1) command creates or queries one or more Postfix lookup. tables, or updates an existing one. If the result files do not exist they will be created with the same. group and other read permissions as their source file. While the table update is in progress, signal delivery is postponed, Correction: you can run postmap on a pcre file; it even creates a .db after doing so. However running postmap on a pcre file results in the errors shown in the question. Postfix is one of the most popular and default MTA as provided in RHEL. It has excellent official documentation, refer here. The idea behind this document is to list down common postfix.
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