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.
Enable advanced PGP features
Defines whether PGP features, like key management are displayed.
Default to using PGP inline for new mails
To show this setting, enable the checkbox Enable Advanced PGP Features. 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.