problem

Dear all,

 

I've been having a problem and I don't know in any way how to solve it.

 

I have tested my mailinglist with 7 e-mail addresses in the list. I send
an e-mail to the list and everything works. 

Now I've added 200 people to the list and I try to send the same e-mail
to my list and it doesn't work. I haven't changed any of the
configurations. 

 

What am I overseeing? Can anyone help me? I've been testing for months
to figure it out but I just can't get it right.

 

Michael