On Apr 25, 2007, at 9:10 AM, David Southwell wrote:
Can anyone please tell me the simplest way I can issue my customers a means of digitally signing emails they transmit to us via our server. I need the chosen method to be compatible with most popular email clients and popular
webmail services.


The most commonly used solution for this is PGP (aka GnuPG, OpenPGP, etc). It's somewhat intrusive, but it is reasonably well supported by most clients. It can be used with webmail services using a local client to sign and/or encrypt the message before pasting it into the webmail's send form.

Another less commonly used alternative is known as S/MIME. It doesn't work well with webmail, and some MUA clients have problems with it, too.

Every customer has their identity and email addresses stored on our mysql
database.

Essentially my target is, as far as possible, to ensure that emails
purporting to come from my customers are indeed from them and noone else.

You're never going to be able to prevent someone from forging emails which claim to be from a client.

You might be able to convince motivated clients to always use PGP/ GnuPG for signing mail, so that forgeries can be readily identified by someone knowledgeable, but be aware that most normal computer users have significant problems dealing with PGP.

--
-Chuck

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