[Users] error when retrieving messages

[Κώστας Θεοφάνους]

Hello,
I've set up my Y! account in Claws Mail but I repeatedly get an error 
message when retrieving emails. The procedures comes to a halt after 
email no. 14:

[10:26:22] POP> RETR 14
[10:27:23] POP< -ERR [SYS/TEMP] Server error - Please try again later.
*** error occurred on POP session
*** Error occurred while processing mail.

Any ideas?
Thank you