Try the forum first because others will benefit from the answer as well. You can also get comments from the other users who have similar problems. But no need to use the forum if you prefer sending an e-mail.
E-mail is especially useful for sending sample code that reproduces a bug, private questions, and support request escalation.
Articles on specific topics (How to, Troubleshooting, etc.).
In the customer area, you can download all the releases that are included in your subscription program.
Please contact firstname.lastname@example.org to discuss the possibility of sponsoring new features.