From about mid-morning today, I have only been able to send emails intermittently. I get an error message on Outlook 2016 that it's because I've apparently sent too may emails recently, or I get another one that says I'm trying to send to too many recipients, even though in some cases the addressees are a total of one person. TalkTalk Business Webmail (I know, don't mock) also doesn't seem to work, but that doesn't tell me why.
I've spoken to lots of people at TalkTalk today, and even have a reference (INC000014122007) but have not received any updates on this issue for several hours now.
Any ideas...or should I just change my ISP?