I need to send an email to 80 customers. I put all 80 email addresses in the "Bcc" field in my Outlook 2010, just as I've done in the past with no problem. But this time when I 'Send', it kicks out all 80 addresses, saying "554 mail server permanently rejected message (#5.3.0)". I'm hoping someone here can give me some direction so I don't waste a lot of time searching for a solution in the wrong place.
Could this be caused by my email provider, which is Network Solutions? Or could it be caused by a setting in Outlook, or something about Windows 10 Pro? I can't imagine it is a problem at the customer level, since all 80 are kicking out immediately.
I did send two of them out individually, and that worked fine. I don't want to test it by putting all 80 email addresses in the normal "To" field, because that's the whole reason I'm trying to use the "Bcc" field.