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How to send signed email using the roundcube, dovecot, and postfix

I have Postfix, Dovecot, Roundcube, and mysql based on Centos 6.3 how can I set it up to send signed email?
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Ashraf Hassanein
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Ashraf Hassanein
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nociSoftware EngineerCommented:
Web-based mail + the secret part of a certificate in general are not a happy combination.
The primary use of Web-Based mail (i.e. Roundcube) is that in can be used from a generic webserver (f.e. a hosted one) where you have no control over the underlying OS , hardware etc.

Those are bad places to leave the private part of certificates lying around. As you can loose them without knowing it.
And because the software needs a readable version of the pass-phrase that is available in the server too.
So basicly there is no valid use case to develop software for this, that is also secure.. (The basic premise why you would want mail encryption anyway.)

Signed & Encrypted email are safe because the underlying premise is that the passphrase never leaves the application that it is entered into.
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Ashraf HassaneinAuthor Commented:
I believe I mixed alot of stuff together,  but to be more specific I want to be able to signed email only from rounscube (not encrypted ).
It more a small business email so I own the server and have a full control on it.
I that  possible.
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nociSoftware EngineerCommented:
Please define signing...:
The cryptographic variant is encrypting portion of the header that you "encrypt"/"hash" using a private/ public key pair so other ca verify you sent the mail. This needs the same pretext as encryption. (only you private key on the server) ... so see above.

Signing as in -- on a line with something beneath it...
That is easy. Go to settings, identity, and fill out the textbox for it. And mark it as html if that is needed.

Be aware to not send your autograph in a picture, otherwise anybody can photoshop that into any letter.
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Ashraf HassaneinAuthor Commented:
Thank you for your clarifications in both posts, the first one explaind a lot
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