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Please use GPG encryption, so you won't send out digital postcards all the time. My GPG key can be found here or you can get it from a keyserver such as hkps.pool.sks-keyservers.net. The key should have the following fingerprint:

0F30 D1A0 2F73 F70A 6FEE 048E 5816 A24C 1075 7FC4

If you are new to mail encryption: This is a very good introductory guide. If you want to go a step further and follow best practices, have a look here.