Please use PK encryption for communications. Remember, sending emails is like sending postcards: anybody along the way can read them. Anything you'd put in an envelope, you should put in an encrypted envelope. GPG is what I'm using now. I like elliptic curve cryptography, but it isn't as wide-spread and is more difficult to use.
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My GPG public key. You can verify this key against the ones in the public servers, or by using finger against ser@germane-software.com. Call me, or email me, if you want me to verify the fingerprint.
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An X.509 certificate. I haven't used this in ages, but it's still good.
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My Pegwit public key. You can find out more about Pegwit at the Pegwit page. There are Windows and Java clients for Pegwit, but Pegwit isn't integrated into anything, making it more difficult to use.
Here are some more links for your edification: