Airmail on OSX 10.12.6

[elipsett]

I've been using FMP13 on MacOSX 10.12.6 with Apple Mail to send FMP-generated emails with attached PDFs. 
I recently switched from Apple Mail to Airmail, and it is now impossible to send emails from FMP.

Does anyone know if Airmail can send mail with attachments on Sierra MacOS 10.12.6, if I upgrade to FMP16?
That's the only reason I might really need to upgrade, and since upgrading to FMP16 will also require a few new computers to run the new OS that the new FMP demands, I'd rather not spend all that money now if I can avoid it.

 

Thanks.