To give a bit more of information: if I disable the POP accounts and only use my IMAP account, then everything works fine. The problem seems to arise when browsing through folders and subfolders in the local Inbox, and trying to send emails from a POP account.
To give a bit more of information: if I disable the POP accounts and only use my IMAP account, then everything works fine. The problem seems to arise when browsing through folders and subfolders in the local Inbox, and trying to send emails from a POP account.