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

*span style="color: green">''''(Em1)''''</span> sent by a TrutzBox: <span style="color: green">fully encrypted (incl. metadata)</span> directly to the receiver TrutzBox (see first case above Se1)