Windows Live Mail.  I have group emails for our film society. How many emails can you put in one email before you encounter problems.  I had problems with 25 in each group and am now having problems with only 22 in it.  I address each group to myself and then do BCC for each group.  I usually get confirmation that it's been sent when my copy comes back to me but they're now not coming back to me so I don't know whether they've gone or not.