PGP
Encryption and signatures are important when sending e-mail. Would you want to send your information written on an open postcard for anybody at the post office to read? Because that's exactly what you are doing when you send a non-encrypted e-mail. Below is my PGP public key. Feel free to encrypt and sign any e-mail sent to me.
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.9 (GNU/Linux) mQGiBEeqG1gRBACGWqWau+dMLFjHTxJ8vC+vSPeJm3FsLWZ1uWA3hTLn7OGK9dle U9XG6LLEKaquKqsNa4tvxtwjQO5w/tRhO+PeoihBxu5VrFUSMCEztI6inotBZHKt MicXZdhtWTU/T/N9K5SxK50apos5Q0Iny6MhF/VO9fUTHZWR/e2vcQAX2wCgyTPL AaoPKlzBSSNRSg0LkY3YdnkD/jnrJVi7rFkqJmB4u3CbCugAoSI4+8mMlHwcycJk AsDmLhlbf2Zxpol4TvMCDmZ6FIy9D2n4k+i59HB1mHk/Cbr1KfdVyPTS7RB2ZcjV VrjeNHMf8qjibc1vwW8T+dR9V8utcP+erPiJKsJZ1sF70tqkO57dLDAPJURBvixU z07dA/sEdS0TF7FLy1Ffo8Hv5/tLh6Mn8JJV1pCHlCAPe3uo+DmMqxgFNw2dx5v5 NlnI5Cjn77Ldoa/XcYZV/SRfGNAVU3kKO93X9lgMSJ/chsw7ty7i8UrgBWWKQdTT kPrwXy01xlDXALYiawjWFauttgJjdUfBrOd4HInQm32w834QxrQnQnJlbmRhbiBK b2hhbiBMZWUgPGRlYWRjeWNsb0BnbWFpbC5jb20+iGMEExECACMCGyMGCwkIBwMC BBUCCAMEFgIDAQIeAQIXgAIZAQUCSu4yYgAKCRDPxTpMDud1YiWWAKDE1ktzK39u /Yq261omxEf8ppcrUQCgg1CvZenQXz1rNpbFXlPO+CpDpvu0K0JyZW5kYW4gSm9o YW4gTGVlIDxicmVuZGFqbEBzdHVkZW50LnVpby5ubz6IYAQTEQIAIAIbIwYLCQgH AwIEFQIIAwQWAgMBAh4BAheABQJK7jJtAAoJEM/FOkwO53ViMQUAn2XebbABVUCy ewfaCX7w3zWwP5dsAJ4qPkE17T7MKh3hg8TCVNFchkfLNLQvQnJlbmRhbiBKb2hh biBMZWUgPGJyZW5kYW4uam9oYW4ubGVlQGdtYWlsLmNvbT6IYAQTEQIAIAIbIwYL CQgHAwIEFQIIAwQWAgMBAh4BAheABQJK7jJtAAoJEM/FOkwO53Vii8kAnjZ/zRbI JSxR81xFDg3id6elMZDyAJ4mGR/s+dUdsjXsCAI16AFZCw0KU7QmQnJlbmRhbiBK b2hhbiBMZWUgPGJyZW5kYWpsQHNpbXVsYS5ubz6IYAQTEQIAIAIbIwYLCQgHAwIE FQIIAwQWAgMBAh4BAheABQJK7jJtAAoJEM/FOkwO53ViPU8AnizjPTVbYOpEpnJU Hx5HLcQbx9ukAJ4zUmDAGS/8PTClEb4S89UyNo03AbQmQnJlbmRhbiBKb2hhbiBM ZWUgPGN5Y2xvQGRpc2t1c2pvbi5ubz6IYAQTEQIAIAIbIwYLCQgHAwIEFQIIAwQW AgMBAh4BAheABQJK7jJtAAoJEM/FOkwO53VioYMAn1XeU++UNnnZun1/IXVRVaIe G3nzAJwNJRsKI8Unv8nwj2HgRrIvpuSgNrQoQnJlbmRhbiBKb2hhbiBMZWUgPGJy ZW5kYW5AdmFubnRldHQubmV0PohgBBMRAgAgBQJMISLeAhsjBgsJCAcDAgQVAggD BBYCAwECHgECF4AACgkQz8U6TA7ndWJPWACffaTzLoxU2bBAp3tCnb7KHVZpaykA niRH7eyftDbx/6vADNPOMTDvf+EgtCpCcmVuZGFuIEpvaGFuIExlZSA8ZGVhZGN5 Y2xvQHZhbm50ZXR0Lm5ldD6IYAQTEQIAIAUCTCEi9gIbIwYLCQgHAwIEFQIIAwQW AgMBAh4BAheAAAoJEM/FOkwO53ViCq0AnjswuMgWVyn9+U4QOEe5jD4IBYIGAJwI 9aMVvbCuXF992GY/ZhY90H8aYbQnQnJlbmRhbiBKb2hhbiBMZWUgPGJyZW5kYWps QGlmaS51aW8ubm8+iGAEExECACAFAkwhIwsCGyMGCwkIBwMCBBUCCAMEFgIDAQIe AQIXgAAKCRDPxTpMDud1Yh5kAJ9UkehskpYgsWWruSn0FNntafGJNQCfWTdN/8qn pbhOlWr/k34XbBF4URC5Ag0ER6obYRAIANjq51gMWc5CS0ALB6BJS/G0+ZGb3rA/ 8kuOiSmqOKIeQti4qf7jDhWkoQhrtCmPUGOc02O5upLs/+FoGsnC/4kJ0IxxSEGI XKvlz3/5jBSFaiooD4PE1ZCo3fpSpMFFyB6n+AjQwbhbe5dksZa3gfpd7P6U6ybx BXu1Van+9Wd9ohVUGHq9pKiSGyZkU7sAeN+JSQHBfvDkEzuTQadXcSqhoUaGBHVS EHPJE1ka2UQlUQ3rwsB06DwbMLs8DyWXPDHL1pfCGdbS50GSKlSgnSLOvzmvRrJF cBrZOtjK2z9FjZDyEXeQCymXljERQil6wfsdDbsyqj73m+XFzDQoQqcAAwcH/3Wv SHKOXfbqOwNUqxQnzalh6dbnnlEECjQW6aZrBgLrpGN0sjWk6oCEmmnUJy4LPLDI +pnRgBEDPxfxBtf3QHk1f8lQtLoaPQ5bjyZ1bxyqx5HKGxXE0thsDu/mxPJpIM3g PUC3k1ogNIVAZomNAZCW9Hjy5Ccko4uB2DUme/NmleP16qTaPe49O1vp0vWw04AX Lc7oVwTLqOlCuY50Ju7/pV97DRNNsghuOb8QOvstFHkO06E3K4F6i1D/I5LYabxr BoCvRYnhf/i1FxOrqHTqNS3J0PDyMamfCeLr6tzpLcNfUerVVHYh0Czm1JgYwPMr gNtYeSZTrQnXlRHUbTWITwQYEQIADwUCR6obYQIbDAUJCWYBgAAKCRDPxTpMDud1 YkMWAJ9NbqkIFq/4X6bUzj4o7ubNJambHQCfa20PPXD9drlMveb8YqGBYB45reU= =1f1C -----END PGP PUBLIC KEY BLOCK-----