I plan to setup a Chatmail server. Upon first registration, is it possible to create a custom localpart address instead of a random one ?
Yes, this is possible for all users.
You might not want to, though. Unless you allow unencrypted e-mails (which Chatmail does not by default, although as server admin you can make exceptions), there is no particular advantage to a memorable username. Contacts are added by scanning a QR code to exchange keys. And random names offer a bit more privacy; there is nothing identifying about a random string.
Good luck with your server! Let us know if you have any issues; the install is intended to be really simple, so reports of complications are bug reports, and welcomed.
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