LuxSci SecureLine end-to-end email encryption allows you to send secure messages to anyone with an email address. If you settings are such that all messages must be encrypted, but where you are allowed to “opt out” on a case-by-case basis, then you can selectively send unencrypted email messages. E.g. a healthcare provider who needs encryption for HIPAA may need to send some messages without private health information as “regular email”. This video shows how “opting out” is done when using any email program (with Mozilla Thunderbird as the example).