HI Guys,
Thanks for your replys. It is my experience that those that hold free isp's only get from 200k to 1mg of mailbox space. When it is full the senders get a 550 return. It is always the same people and it takes up a lot of my time that is becoming more limited all the time as new members sign up.
When their box is empty then there is no problem. Once is a great while a filter will look at a subject line and say "OH NO, not this one". Because I know this I try to be very careful about subject lines. I often change yours so it will get thru those filters. Yes the problem is too much spam that fills up free mailbox's too fast.
Incidently those 4 mail box's are working fine today. I will add them back now but I have a record of them and eventually they may be permanently deleted due to necessisity.
Thanks for your help
Bebop