For sending FileMaker has the ability to send via SMTP. However to receive, you will need a plugin to grab the data via IMAP or POP. I use 360 Works Email. There are others out there inclduing Dacon's Mailit and CNS's SMTPit & Pop3it.
So there is no other way...?
I got to buy a plugin... This project is getting expencier by the day.
I'll try the 360 works plugin there... It has a gmail function...