email problem

[Niels Siemons/SVDT]

Hello,

I've got a problem with a bulkmail sending:
The situation:

I loop throw a list of users for who I create an email node
After a while (about 100 e-mails) I get a Exception: node could not be found.

Via the email tool in mmadmin. I can see that the messagequeue is growing and being send.

Does someone has a suggestion?

Mail settings
Max number of queued messages in memory  500  
Messages queued time  3600  
Queued probe time  300  

Thanks,
Niels