All encrypted e-mails received by the TrutzBox are automatically decrypted by the TrutzBox and made available for retrieval of an e-mail program. The TrutzBox can also receive e-mails from normal e-mail servers. These can be either encrypted or unencrypted. To show the recipient of the e-mail whether the e-mail was encrypted or unencrypted and whether the TrutzBox was able to check the sender's signature, the TrutzBox adjusts the mail subject field in the e-mail.<br/>The TrutzBox places text in square brackets before the mail subject as <u>first the letter </u>

*U - for unsigned (the TrutzBox could not confirm the sender), or