Sage 2017 PU2 Emailing Statements with new SMTP setting using Office 365

We recently upgraded our client to Sage 300 2017 with PU2 and have been using the new STMP email option now available. The general day to day sending of orders, invoices, and purchase orders has been working without any issues, however when it comes to running statements we are having problems.

The maximum we have been able to email at a time is approx. 20 and none of the attachments exceed the Office 365 limit. Any suggestions would be appreciated.

Thanks