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If you are truly paranoid I agree with the PGP/openPGP/gnuPG/pgpi suggestion; with mail encrypted before it leaves your system it doesn't matter what the provider is. In addition, while your own email server might "protect" you from peeping email service providers (unlikely as I find that) the mails will still not be protected on the various hops it makes to its destination and be vulnerable to interception.
Of course, with PGP you will have to have a receiver who is also capable/willing to decrypt.
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