Can't download emails with large file attachment Dovecot on Centos

Hi,
I am using CentOS 5.9 with postfix+dovecot v1.0.7
I have problem in downloading emails with attachment of more than 3MB via my email client. (Thunderbird, Outlook, etc) I can send emails out with more than 3MB without any problem, whereas i can't download emails.

Following is the error i found on maillog
dovecot: pop3-login: SSL_write() syscall failed: Bad file descriptor

After this the email client stops downloading emails.

What could be the problem ? Please help me fix this . Thank You

 

You can try to increase the value of 'login_process_size' in your Dovecot configuration file.

Check http://wiki.dovecot.org/MainConfig for more details.

 

Thanks for the reply rosehosting, yes i've already set the login_process_size to 64 and higher but the problem still persist only with dovecot-pop. Whereas dovecot-imap works fine.

Any other clues to fix this problem ?