folder name can be duplicated for same name with different domain

[unkcpz]

The remote folder of each user has name created from the string of user email the part before @ symbol. The non-alphabet letter will converted to underscore. For instance, the email "[email protected]" will have the remote folder created named m_a. However, if only the email domain is different, the folder name will be duplicated. The "[email protected]" and "[email protected]" will have the same remote folder name which cause the issue.