rails - rails6 特别神奇的问题 "cannot load such file -- net/smtp, net-imap, net-pop" in rails
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refer to
How to fix #ruby 3.1.0 "cannot load such file -- net/smtp, net-imap, net-pop" in #rails and co. :
```
# just add to Gemfile
gem 'net-smtp', require: false
gem 'net-imap', require: false
gem 'net-pop', require: false