Merge branch '6270-allow-special-characters-in-folder-name-when-using-e-mail-filter' into 'develop'
Resolve "Allow special characters in folder name when using e-mail filter" Closes #6270 See merge request ispconfig/ispconfig3!1581
Resolve "Allow special characters in folder name when using e-mail filter" Closes #6270 See merge request ispconfig/ispconfig3!1581