Can't use bounced e-mail feature of email newsletter

Hi there!

I have been trying to get the bounced e-mail pop3 settings right.
Whatever I try, when running cron.php it won't finish en come up with a 'warning' (no info what so ever)
When I remove all settings in the 'receive' section of the email newsletter configuration screen the cron.php job runs just fine and also the email newsletter are being send.

Here are the settings I use, I'm sure I use the right username and password.

Receiving (Undelivered)

Connection Type: POP
How to connect to your mail server.

Mailbox Host: mail.urbanlegends.nl
Your host mail sever, usualy in the format: mail.yourdomain.com

Mailbox Port: 110
For POP connection usually: '110/pop3''. For IMAP usually: '143'.

Extra commands:(none)
Optional. In some circumstances you need to issue extra commands to connect to your mail server (e.g. "/notls", "/novalidate-cert" etc.). See documentation for imap_open. Begin the string with a "/", separating each subsequent command with another "/"

Bounce Mailbox: albert@urbanlegends.nl
The email address you would like messages to bounce back to if undelivered.

Mailbox Username: albert@urbanlegends.nl
Username of mailbox for receiving undelivered email, usually the address of the mailbox: bounce@yourdomain.com.

Mailbox Password: ******
Password of mailbox for receiving undelivered email.

Max Process:50
Maximum number of bounced emails to process per run.

Store Processed: 48
How long to store copy of processed messages in Drupal. (hours)

Bounce Limit: 3
Stop sending to an address after this number of bounces

Set Return-Path:
Yes

I also have tried this with to other pop3 accounts and all the same problem. Any ideas maybe?

Thanx! Regards Albert