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If an email is to be ''sent''' via the TrutzBox, the TrutzBox first checks whether the recipient is a TrutzBox …

*<span style="color: green">'''(Se1)'''</span> if yes, <span style="color: green" >email content and metadata are automatically encrypted by the TrutzBox </span> and sent to the recipient TrutzBox via TrutzMail,

If the TrutzBox knows a public key for a mail recipient whose mail address does not end with @comidio.email, this e-mail is encrypted with it.

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===== Receive e-mails =====

If an e-mail is to be ''received''' via the TrutzBox (i.e. the target address ends with @comidio.email), there are three differentiations: