[IMAP] Creating or updating folder '/Junk E-mail' failed due to the following error: The folder name field accepts alphabets, numbers and underscore characters only

I received a Junk email, which I wanted to block the domain and created a rule which moves emails from any address on this domain to Junk in future.

But my eM client created a rule by which it was trying to create a new folder on my Mail Server (Rediffmailpro) by name “Junk E-mail”.

Since Rediffmailpro doesn’t support folder name creation with blanks, it is blocking the folder creation and I am continuosly getting this error message on my eM Client.

I removed the rule from the eM Client, but still this message is regularly coming, which is very bothering. Can someone advise how to remove this setting permanently?