By default, Mailcrypt will use the same public keyring that PGP would use if executed from the shell.
You can cause Mailcrypt to use a specific public keyring by setting the
mc-pgp-alternate-keyring. If this variable is set,
Mailcrypt will use that keyring for all functions which would otherwise
have used the default. This includes adding keys, extracting keys,
verifying signatures, and encrypting messages.
This feature might be useful if you maintain multiple keyrings; you can switch between them by setting this variable. Depending on your tastes, you might want to configure fetching from a keyring as well (see Keyring Fetch).Miscellaneous Configuration Miscellaneous Configuration Comment Field