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Signed internet mails

SMIME signed mail are often proccessed by security mail applicances. Some of them are only proccesing signed mail with a X.509 certificate and the extension ".cer". Notes sents signed mail with a "p7s" attachment. This is RFC5751 compliant. Anyway these signed mails are dropped by some security mail applicances and there ist no possibility to establish a SMIME encrypted connection.


A switch to select the signed internet mail format.

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  • Oct 31 2018
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    Thomas Hampel commented
    28 Jan 22:01

    How can a sender know anything about the recipients mail systems preferences?