MDBSQ
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Syntax:
	MDBSQ [-i <inputfile>] [-o <outputfile>] [<host/domain>] ...

MDBSQ is short for "Mail DataBaSe Query". It retrieves information
from the MDBS file (see MDBS(1)). For each host or domain specified
as interactive input (no -i option or <host/domain> argument), in
the <inputfile> or on the command line, it will print (if known and
appropriate) the mail path, a domain-style name and the cost field.

You leave interactive mode with an empty input line.
