The following settings are available.
Default to send encrypted when composing email
Defines whether a new E-Mail is encrypted with PGP per default.
Default adding signature to outgoing mails
Defines whether a new E-Mail is encrypted with PGP per default.
PGP default to using PGP inline for compatibility
Defines whether the PGP encryption is done inline. Only use those settings if the E-Mail client of a recipient does not support PGP, the message should be readable though. If you use this setting, you can not send E-Mails in html format.