scp was working fine, but now when I do
$ scp /path/to/local/file email@example.com
it doesn't ask for my password, but returns nothing immediately, and a new file named "firstname.lastname@example.org" is created in the directory.
Also, I have not problem ssh to server, it asks for my password and I could log in successfully.
$ ssh email@example.com
I did some configuration to set up VIM as IDE for C++ over the weekend, so I might have messed something? I've also created a new anaconda environment for running Python3, if these information help.