mu-verify - Man Page

verify message signatures and display information about them


mu [common-options] verify [options] [<file> ... ]


mu verify is the mu command for verifying message signatures (such as PGP/GPG signatures) and displaying information about them. The sub-command works on message files, and does not require the message to be indexed in the database.

If no message file is provided, the command expects the message on standard-input.

Verify Options

-r, --auto-retrieve

attempt to find keys online (see the auto-key-retrieve option in the gnupg(1) documentation).


attempt to decrypt the message

Common Options

-d, --debug

makes mu generate extra debug information, useful for debugging the program itself. By default, debug information goes to the log file, ~/.cache/mu/mu.log. It can safely be deleted when mu is not running. When running with --debug option, the log file can grow rather quickly. See the note on logging below.

-q, --quiet

causes mu not to output informational messages and progress information to standard output, but only to the log file. Error messages will still be sent to standard error. Note that mu index is much faster with --quiet, so it is recommended you use this option when using mu from scripts etc.


causes mu to not output log messages to standard error, in addition to sending them to the log file.


do not use ANSI colors. The environment variable NO_COLOR can be used as an alternative to --nocolor.

-V, --version

prints mu version and copyright information.

-h, --help

lists the various command line options.


To display aggregated (one-line) information about the verification status in a message:

$ mu verify msgfile

To display information about all the signatures:

$ mu verify --verbose msgfile

If you only want to use the exit code, you can use:

$ mu verify --quiet msgfile

which does not give any output unless there is an error.

Reporting Bugs

Please report bugs at


Dirk-Jan C. Binnema <>

See Also