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As per the manual, you can set that when TLS is not available the message will be encrypted.
Is Sophos also checking if the certificate is valid? In the email appliance, you can separately choose both options.
You can select the following encryption options:
TLS prevents eavesdropping and tampering with the message in transit.
Hi olofd Sophos Central Email does not check for the certificate.
This feature is only available with an Email Advanced license.
The encryption type Sophos Email uses is push-based email encryption using AES 256.
To turn encryption on or off, go to Email Gateway > Settings > Encryption settings.
The email and attachments are encrypted with a password.
After setting the password, you receive an email from Sophos including the encrypted email and any encrypted attachments. To access them, open them and type in the password you created.
You can reply to encrypted emails securely by clicking Reply on the encrypted PDF.
The steps are the same as above, however, only attachments are encrypted.
In reply to Keyur:
Can you add this as a feature request?
In reply to olofd:
Hi olofd I would request you to submit your idea/feature request to https://ideas.sophos.com/