Getting Error Message: AUP#Out-1550
When I send an email to multiple groups I get an error message, AUP#Out-1550. I have to break up the groups and send one group at a time and everything works well. There are no bad email addresses in any of the groups, and I do not get the message if I send it to one group at a time. Why does this happen? I used to be able to do this in the past under Time Warner. I think it happened when Spectrum (Charter) too over. Thanks for any suggestions.