The JavaMail API's license agreement is so confusing since I am not a lawyer.
I want to use JavaMail for a closed-source, commercial project on the server-side of an email service, which offers email functionality to our customers.
So, am I allowed to use JavaMail or do I have to pay a license fee or release my code under an open-source license or something like that?
The most important thing to respect is probably this statement:
You acknowledge that Software is not designed, licensed or intended for use in the design, construction, operation or maintenance of any nuclear facility
Seriously, here is what can be found in the FAQ:
Q: Is the JavaMail API implementation completely free? Can I ship it along with my product?
A: Yes. The current release of the JavaMail API implementation, is completely free and you can include it in your product. This release includes IMAP, POP3, and SMTP providers as well. Please do read the license and ensure that you understand it. (The license is available after clicking the Download button on the download page.) The JavaBeans Activation Framework is also free for use under a similar license.