Tested with TB 78.4.1 on Linux. Once checked, for me the 'Add my digital signature by default' setting is kept for the secondary identity. However, when sending an encrypted message from the secondary identity, in the Write window, the option 'Digitally Sign This Message' is not checked, despite of 'Add my digital signature by default' is set for the identity. As a result the message is sent without a signature, unless the option 'Digitally Sign This Message' is set manually in the Write window.
Bug 1667088 Comment 1 Edit History
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Tested with TB 83.0b2 on Linux. Once checked, for me the 'Add my digital signature by default' setting is kept for the secondary identity. However, when sending an encrypted message from the secondary identity, in the Write window, the option 'Digitally Sign This Message' is not checked, despite of 'Add my digital signature by default' is set for the identity. As a result the message is sent without a signature, unless the option 'Digitally Sign This Message' is set manually in the Write window.