Mail Merge function is broken

Mail Merge function is broken

Hi there,

I've previously used the mail merge function on almost a daily basis. For the last week now it seems to be completely broken.

Upon running the mail merge you will get a success email "Merge has been completed! ✅" however all the emails failed.

The error is Failed (28)

I've tried multiple forms and different input data and it doesn't seem to work. 

Also your lodge a problem form is also broken, upon clicking the submit button nothing happens and I can see javascript errors in the console.

Would really appreciate if this could be looked into ASAP.