I would suggest using Ciphermail / Djigzo for this.But I think you are solving your problem in a very incorrect way. Since the hosting company do have access to the VM, they could easy listen on the memory before the mail is encrypted, just after it has been decrypted by the TLS handler.
If you only are worried by backups or other copies that might come in the wrong hands, and not someone directly accessing the server, I would suggest setting up a encrypted storage in the server. Since VPS/VM in many times give you root access, you could easily set your virtual machine to be encrypted with LUKS, and then you have to type a password each time the VM boot.
Any backups made of the VM will then be encrypted.-----Ursprungligt meddelande----- From: Thomas Keller
Sent: Wednesday, June 03, 2015 12:48 AM To: Postfix users Subject: encrypt incoming emails with my public gpg key Hello, my Postfix server is running as a VM in a hosted (untrusted) environment. In theory, the data on the server (i.e. my emails) could be on some backup tape, or copies could be lying around in the datacenter. Some of my emails are encrypted (people send me encrypted emails) but most are not. Would it be possible / what would be the best way to set up some filter in Postfix, so that all plaintext emails would be encrypted upon delivery with my gpg public key. In effect, if would like like all people send me encrypted emails.What would be the best way to achieve this ?
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