Thank you for your post.
With Instant Web Publishing, you do have the ability to send Emails through a SMTP Server. FileMaker Pro does not have a way to receive emails.
Performing a web search for "FileMaker Email Plugin" resulted in 400,000+ records, so you should be able to ask those manufacturers/developers for detailed information.
Does anyone have experience with Receiving emails through Instant Web Publishing?
I using SMTPit Pro and POP3it Pro plugins.