Contact Andrew Yu

There are many ways to contact me. None of these require proprietary software.

Electronic mail to andrew AT andrewyu DOT org. (Please sign and encrypt messages if possible. See below.)
Electronic mail to andrew-public-inbox AT andrewyu DOT org for things that are to be discussed publicly but are addressed to me. See archives.
Paper mail to Yu, Andrew (Run Xi 于润熙, s22537%29, 1800, Lane 900 North Sanxin Road, Songjiang District, Shanghai, China 201620. (Note that I do not check school mail daily and I can't check it during vacations. Please do not attempt to use OpenPGP encryption or such for paper mail.)
Internet Relay Chat to Andrew on Libera.Chat and irc.andrewyu.org.
Simple Internet Mail Protocol mail to andrew AT andrewyu DOT org.
SIMP, and my implementation Ememo are under active development and are extremely incomplete. This is not a reliable channel for communication. And because the protocol specification is updated slower than the testbed implementation, please refer to the latest Ememo implementation when sending messages.

Please do not contact me via WeChat. (Same for other proprietary stuff like Discord.)
I do not use modern “social media” like Twitter or Weibo, here's why.
Please follow these communication guidelines when applicable.
If you are a student of YK Pao School and would like to contact me for school-related purposes, use this.

OpenPGP

If you have no idea what these mean, read the Email Self Defense tutorial.

Usually, electronic mail that I send are signed with my OpenPGP key. Please use OpenPGP when contacting me through electronic mail. The following are available.

In order to verify the authenticity of the key, check if you've actually downloaded these keys from andrewyu.org, and also check the fingerprints with me elsewhere (email, IRC, in real life, etc) before trusting or signing it.

Once confirmed, please sign and share my key in order to build the OpenPGP Web of Trust.