10.5: Set up host-specific mandatory TLS in Mail Service: "I recently had an instance in which a client company was insisting that all email communications between our servers being encrypted with TLS. We're using Leopard Server 10.5.5 (which includes Postfix 4.3.1), but it took some extra tweaking to make it work, so I thought I'd pass it on in case anyone else here ever needs it.
This hint assumes that you have a Leopard Server running Mail Service which needs to be able to receive email from servers out on the Internet, and a security certificate for your mail server. (In Server Admin GUI for Mail Service, that would translate to having SSL set to Use (not Require) for SMTP with the correct certificate selected.) You will need a certificate for this to work, and preferably one issued by a certificate authority.
When we're done, you'll be using Opportunistic TLS (offers TLS but doesn't require it, since most ISP email servers don't use i...
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(Via Clippings.)
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