Let's start with an example: It's Sunday night, you own an online housekeeping store, you're watching the evening news and the President's message about the sudden coronavirus pandemic. Fortunately, a week ago you made an order for disinfectants (pure coincidence), you know that now everyone will be happy to stock up on this type of product. You also have a data set of e-mail addresses of existing customers (who have agreed to receive marketing messages), but how to inform customers that you have a large stock of the now desired goods?
Just send an email to each of them encouraging them to buy the disinfectant in your store. A simple matter? Not necessarily, especially when your customer list is beyond your Twitter post limit and you already have several thousand?
One thing is for sure, you won't do it right with your corporate email.