As treasurer of a school bus group, I sometimes have to send e-mails out to about 100 recipients at the same time and I agreed with my ISP (who would otherwise limit recipients) that I would be able to do this. In the last few weeks, however, I have started to get these e-mails bounced back to me saying "The following recipient(s) could not be reached:" followed by a list of the e-mail addresses I had sent it to, each with the date and time and stating "452 Too many recipients". My ISP sysop says that these messages are not from him and that it is because of something in my settings. However, I am not aware of having changed any settings. Can anyone tell me whose "fault" it is and how to deal with it, please? I am using Outlook 2003 SP3.