Every valid email consists of name and domain, separated by the '@' sign. Besides lowercase letters, the email may contain one or more '.' or '+'. For example, in "firstname.lastname@example.org", "alex" is the name, and "checkio.org" is the domain.
If you add periods '.' between some characters in the name part of an email address, mail sent there will be delivered to the same address without dots in the name. Note that this rule does not apply to domain names. For example, "email@example.com"...
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CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium