PDF>fillable form>problem with sending email

I created a fillable form in a PDF and I used the "emailto:" setting correctly. I have tested it out on numerous computers throughout my company and it has appeared in the email inbox of my supplied email with no problem. However, when my manager went to test the "Submit by Email" button I created on the PDF fillable form, it does not sync up with the "Select Email Client" box. It starts to do a 'send/receive" on her Microsoft Outlook. When I go and check to see if it sent anything at all to the designated email inbox it sends like 15 forms (some of them open and some of them do not). I assume that is just from her clicking a zillion times. But, I am curious to figure out why the "sent/receive" button appears on the bottom right-hand corner of her screen?!

Is there a security setting that she might not have clicked that everyone else does? Also, the "Print Form" button I created right next to the "Submit by Email" box works perfectly.

Any help is appreciated!