Hi @shaun695268
We have already fixed this issue and will release it in the new version of the plugin tomorrow.
The issue based on SendGrid, they changed API and we had to rewrite the whole module in our plugin.
After Tuesday update, you’ll need to indicate API key here – http://prnt.sc/erwhr0. However the key on this page https://app.sendgrid.com/settings/api_keys is not full. This may have been done on purpose for security reasons.
The full API key you can see when creating it, after that you see only the part of the key. So please try to create a new key, copy it at once and paste it to the plugin – http://prnt.sc/erwhds. Let me know if you’ll have any problems with it.